local bit = require('bit')
local t = require('test.unit.testutil')
local t_eval = require('test.unit.eval.testutil')

local itp = t.gen_itp(it)

local OK = t.OK
local eq = t.eq
local neq = t.neq
local ffi = t.ffi
local FAIL = t.FAIL
local NULL = t.NULL
local cimport = t.cimport
local to_cstr = t.to_cstr
local alloc_log_new = t.alloc_log_new
local concat_tables = t.concat_tables
local map = vim.tbl_map

local a = t_eval.alloc_logging_t
local int = t_eval.int
local list = t_eval.list
local dict = t_eval.dict
local eval0 = t_eval.eval0
local lst2tbl = t_eval.lst2tbl
local dct2tbl = t_eval.dct2tbl
local typvalt = t_eval.typvalt
local type_key = t_eval.type_key
local li_alloc = t_eval.li_alloc
local first_di = t_eval.first_di
local nil_value = t_eval.nil_value
local func_type = t_eval.func_type
local null_list = t_eval.null_list
local null_dict = t_eval.null_dict
local dict_items = t_eval.dict_items
local list_items = t_eval.list_items
local empty_list = t_eval.empty_list
local lua2typvalt = t_eval.lua2typvalt
local typvalt2lua = t_eval.typvalt2lua
local null_string = t_eval.null_string
local callback2tbl = t_eval.callback2tbl
local tbl2callback = t_eval.tbl2callback
local dict_watchers = t_eval.dict_watchers

local lib = cimport(
  './src/nvim/eval/typval.h',
  './src/nvim/memory.h',
  './src/nvim/mbyte.h',
  './src/nvim/garray.h',
  './src/nvim/eval.h',
  './src/nvim/vim_defs.h',
  './src/nvim/globals.h'
)

local function vimconv_alloc()
  return ffi.gc(ffi.cast('vimconv_T*', lib.xcalloc(1, ffi.sizeof('vimconv_T'))), function(vc)
    lib.convert_setup(vc, nil, nil)
    lib.xfree(vc)
  end)
end

local function list_watch_alloc(li)
  return ffi.cast('listwatch_T*', ffi.new('listwatch_T[1]', { { lw_item = li } }))
end

local function list_watch(l, li)
  local lw = list_watch_alloc(li or l.lv_first)
  lib.tv_list_watch_add(l, lw)
  return lw
end

local function get_alloc_rets(exp_log, res)
  setmetatable(res, {
    __index = {
      freed = function(r, n)
        return { func = 'free', args = { r[n] } }
      end,
    },
  })
  for i = 1, #exp_log do
    if ({ malloc = true, calloc = true })[exp_log[i].func] then
      res[#res + 1] = exp_log[i].ret
    end
  end
  return exp_log
end

local alloc_log = alloc_log_new()

before_each(function()
  alloc_log:before_each()
end)

after_each(function()
  alloc_log:after_each()
end)

local function ga_alloc(itemsize, growsize)
  local ga = ffi.gc(ffi.cast('garray_T*', ffi.new('garray_T[1]', {})), lib.ga_clear)
  lib.ga_init(ga, itemsize or 1, growsize or 80)
  return ga
end

local function check_emsg(f, msg)
  local saved_last_msg_hist = lib.last_msg_hist
  if saved_last_msg_hist == nil then
    saved_last_msg_hist = nil
  end
  local ret = { f() }
  local last_msg = lib.last_msg_hist ~= nil and ffi.string(lib.last_msg_hist.msg) or nil
  if msg ~= nil then
    eq(msg, last_msg)
    neq(saved_last_msg_hist, lib.last_msg_hist)
  else
    if saved_last_msg_hist ~= lib.last_msg_hist then
      eq(nil, last_msg)
    else
      eq(saved_last_msg_hist, lib.last_msg_hist)
    end
  end
  return unpack(ret)
end

describe('typval.c', function()
  describe('list', function()
    describe('item', function()
      describe('remove()', function()
        itp('works', function()
          local l = list(1, 2, 3, 4, 5, 6, 7)
          neq(nil, l)
          local lis = list_items(l)
          alloc_log:check({
            a.list(l),
            a.li(lis[1]),
            a.li(lis[2]),
            a.li(lis[3]),
            a.li(lis[4]),
            a.li(lis[5]),
            a.li(lis[6]),
            a.li(lis[7]),
          })

          eq(lis[2], lib.tv_list_item_remove(l, lis[1]))
          alloc_log:check({
            a.freed(table.remove(lis, 1)),
          })
          eq(lis, list_items(l))

          eq(lis[7], lib.tv_list_item_remove(l, lis[6]))
          alloc_log:check({
            a.freed(table.remove(lis)),
          })
          eq(lis, list_items(l))

          eq(lis[4], lib.tv_list_item_remove(l, lis[3]))
          alloc_log:check({
            a.freed(table.remove(lis, 3)),
          })
          eq(lis, list_items(l))
        end)
        itp('also frees the value', function()
          local l = list('a', 'b', 'c', 'd')
          neq(nil, l)
          local lis = list_items(l)
          alloc_log:check({
            a.list(l),
            a.str(lis[1].li_tv.vval.v_string, 1),
            a.li(lis[1]),
            a.str(lis[2].li_tv.vval.v_string, 1),
            a.li(lis[2]),
            a.str(lis[3].li_tv.vval.v_string, 1),
            a.li(lis[3]),
            a.str(lis[4].li_tv.vval.v_string, 1),
            a.li(lis[4]),
          })
          local strings = map(function(li)
            return li.li_tv.vval.v_string
          end, lis)

          eq(lis[2], lib.tv_list_item_remove(l, lis[1]))
          alloc_log:check({
            a.freed(table.remove(strings, 1)),
            a.freed(table.remove(lis, 1)),
          })
          eq(lis, list_items(l))

          eq(lis[3], lib.tv_list_item_remove(l, lis[2]))
          alloc_log:check({
            a.freed(table.remove(strings, 2)),
            a.freed(table.remove(lis, 2)),
          })
          eq(lis, list_items(l))

          eq(nil, lib.tv_list_item_remove(l, lis[2]))
          alloc_log:check({
            a.freed(table.remove(strings, 2)),
            a.freed(table.remove(lis, 2)),
          })
          eq(lis, list_items(l))
        end)
        itp('works and adjusts watchers correctly', function()
          local l = ffi.gc(list(1, 2, 3, 4, 5, 6, 7), nil)
          neq(nil, l)
          local lis = list_items(l)
          -- Three watchers: pointing to first, middle and last elements.
          local lws = {
            list_watch(l, lis[1]),
            list_watch(l, lis[4]),
            list_watch(l, lis[7]),
          }
          alloc_log:check({
            a.list(l),
            a.li(lis[1]),
            a.li(lis[2]),
            a.li(lis[3]),
            a.li(lis[4]),
            a.li(lis[5]),
            a.li(lis[6]),
            a.li(lis[7]),
          })

          eq(lis[5], lib.tv_list_item_remove(l, lis[4]))
          alloc_log:check({ a.freed(lis[4]) })
          eq({ lis[1], lis[5], lis[7] }, { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item })

          eq(lis[3], lib.tv_list_item_remove(l, lis[2]))
          alloc_log:check({ a.freed(lis[2]) })
          eq({ lis[1], lis[5], lis[7] }, { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item })

          eq(nil, lib.tv_list_item_remove(l, lis[7]))
          alloc_log:check({ a.freed(lis[7]) })
          eq(
            { lis[1], lis[5], nil },
            { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item == nil and nil }
          )

          eq(lis[3], lib.tv_list_item_remove(l, lis[1]))
          alloc_log:check({ a.freed(lis[1]) })
          eq(
            { lis[3], lis[5], nil },
            { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item == nil and nil }
          )

          lib.tv_list_watch_remove(l, lws[2])
          lib.tv_list_watch_remove(l, lws[3])
          lib.tv_list_watch_remove(l, lws[1])
          lib.tv_list_free(l)
          alloc_log:check({
            a.freed(lis[3]),
            a.freed(lis[5]),
            a.freed(lis[6]),
            a.freed(l),
          })
        end)
      end)
    end)
    describe('watch', function()
      describe('remove()', function()
        itp('works', function()
          local l = ffi.gc(list(1, 2, 3, 4, 5, 6, 7), nil)
          eq(nil, l.lv_watch)
          local lw = list_watch(l)
          neq(nil, l.lv_watch)
          alloc_log:clear()
          lib.tv_list_watch_remove(l, lw)
          eq(nil, l.lv_watch)
          alloc_log:check({
            -- Does not free anything.
          })
          local lws = { list_watch(l), list_watch(l), list_watch(l) }
          alloc_log:clear()
          lib.tv_list_watch_remove(l, lws[2])
          eq(lws[3], l.lv_watch)
          eq(lws[1], l.lv_watch.lw_next)
          lib.tv_list_watch_remove(l, lws[1])
          eq(lws[3], l.lv_watch)
          eq(nil, l.lv_watch.lw_next)
          lib.tv_list_watch_remove(l, lws[3])
          eq(nil, l.lv_watch)
          alloc_log:check({
            -- Does not free anything.
          })
        end)
        itp('ignores not found watchers', function()
          local l = list(1, 2, 3, 4, 5, 6, 7)
          local lw = list_watch_alloc()
          lib.tv_list_watch_remove(l, lw)
        end)
      end)
    end)
    -- add() and fix() were tested when testing tv_list_item_remove()
    describe('free()', function()
      itp('recursively frees list', function()
        local l1 = ffi.gc(list(1, 'abc'), nil)
        local l2 = ffi.gc(list({}), nil)
        local l3 = ffi.gc(list(empty_list), nil)
        local alloc_rets = {}
        alloc_log:check(get_alloc_rets({
          a.list(l1),
          a.li(l1.lv_first),
          a.str(l1.lv_last.li_tv.vval.v_string, #'abc'),
          a.li(l1.lv_last),
          a.list(l2),
          a.dict(l2.lv_first.li_tv.vval.v_dict),
          a.li(l2.lv_first),
          a.list(l3),
          a.list(l3.lv_first.li_tv.vval.v_list),
          a.li(l3.lv_first),
        }, alloc_rets))
        lib.tv_list_free(l1)
        alloc_log:check({
          alloc_rets:freed(2),
          alloc_rets:freed(3),
          alloc_rets:freed(4),
          alloc_rets:freed(1),
        })
        lib.tv_list_free(l2)
        alloc_log:check({
          alloc_rets:freed(6),
          alloc_rets:freed(7),
          alloc_rets:freed(5),
        })
        lib.tv_list_free(l3)
        alloc_log:check({
          alloc_rets:freed(9),
          alloc_rets:freed(10),
          alloc_rets:freed(8),
        })
      end)
    end)
    describe('free_list()', function()
      itp('does not free list contents', function()
        local l1 = ffi.gc(list(1, 'abc'), nil)
        local l2 = ffi.gc(list({}), nil)
        local l3 = ffi.gc(list(empty_list), nil)
        local alloc_rets = {}
        alloc_log:check(get_alloc_rets({
          a.list(l1),
          a.li(l1.lv_first),
          a.str(l1.lv_last.li_tv.vval.v_string, #'abc'),
          a.li(l1.lv_last),
          a.list(l2),
          a.dict(l2.lv_first.li_tv.vval.v_dict),
          a.li(l2.lv_first),
          a.list(l3),
          a.list(l3.lv_first.li_tv.vval.v_list),
          a.li(l3.lv_first),
        }, alloc_rets))
        lib.tv_list_free_list(l1)
        alloc_log:check({
          alloc_rets:freed(1),
        })
        lib.tv_list_free_list(l2)
        alloc_log:check({
          alloc_rets:freed(5),
        })
        lib.tv_list_free_list(l3)
        alloc_log:check({
          alloc_rets:freed(8),
        })
      end)
    end)
    describe('free_contents()', function()
      itp('recursively frees list, except for the list structure itself', function()
        local l1 = ffi.gc(list(1, 'abc'), nil)
        local l2 = ffi.gc(list({}), nil)
        local l3 = ffi.gc(list(empty_list), nil)
        local alloc_rets = {}
        alloc_log:check(get_alloc_rets({
          a.list(l1),
          a.li(l1.lv_first),
          a.str(l1.lv_last.li_tv.vval.v_string, #'abc'),
          a.li(l1.lv_last),
          a.list(l2),
          a.dict(l2.lv_first.li_tv.vval.v_dict),
          a.li(l2.lv_first),
          a.list(l3),
          a.list(l3.lv_first.li_tv.vval.v_list),
          a.li(l3.lv_first),
        }, alloc_rets))
        lib.tv_list_free_contents(l1)
        alloc_log:check({
          alloc_rets:freed(2),
          alloc_rets:freed(3),
          alloc_rets:freed(4),
        })
        lib.tv_list_free_contents(l2)
        alloc_log:check({
          alloc_rets:freed(6),
          alloc_rets:freed(7),
        })
        lib.tv_list_free_contents(l3)
        alloc_log:check({
          alloc_rets:freed(9),
          alloc_rets:freed(10),
        })
      end)
    end)
    describe('unref()', function()
      itp('recursively frees list when reference count goes to 0', function()
        local l = ffi.gc(list(empty_list), nil)
        local alloc_rets = {}
        alloc_log:check(get_alloc_rets({
          a.list(l),
          a.list(l.lv_first.li_tv.vval.v_list),
          a.li(l.lv_first),
        }, alloc_rets))
        l.lv_refcount = 2
        lib.tv_list_unref(l)
        alloc_log:check({})
        lib.tv_list_unref(l)
        alloc_log:check({
          alloc_rets:freed(2),
          alloc_rets:freed(3),
          alloc_rets:freed(1),
        })
      end)
    end)
    describe('drop_items()', function()
      itp('works', function()
        local l_tv = lua2typvalt({ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 })
        local l = l_tv.vval.v_list
        local lis = list_items(l)
        -- Three watchers: pointing to first, middle and last elements.
        local lws = {
          list_watch(l, lis[1]),
          list_watch(l, lis[7]),
          list_watch(l, lis[13]),
        }
        alloc_log:clear()

        lib.tv_list_drop_items(l, lis[1], lis[3])
        eq({ 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 }, typvalt2lua(l_tv))
        eq({ lis[4], lis[7], lis[13] }, { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item })

        lib.tv_list_drop_items(l, lis[11], lis[13])
        eq({ 4, 5, 6, 7, 8, 9, 10 }, typvalt2lua(l_tv))
        eq(
          { lis[4], lis[7], nil },
          { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item == nil and nil }
        )

        lib.tv_list_drop_items(l, lis[6], lis[8])
        eq({ 4, 5, 9, 10 }, typvalt2lua(l_tv))
        eq(
          { lis[4], lis[9], nil },
          { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item == nil and nil }
        )

        lib.tv_list_drop_items(l, lis[4], lis[10])
        eq(empty_list, typvalt2lua(l_tv))
        eq(
          { true, true, true },
          { lws[1].lw_item == nil, lws[2].lw_item == nil, lws[3].lw_item == nil }
        )

        lib.tv_list_watch_remove(l, lws[1])
        lib.tv_list_watch_remove(l, lws[2])
        lib.tv_list_watch_remove(l, lws[3])

        alloc_log:check({})
      end)
    end)
    describe('remove_items()', function()
      itp('works', function()
        local l_tv =
          lua2typvalt({ '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13' })
        local l = l_tv.vval.v_list
        local lis = list_items(l)
        local strings = map(function(li)
          return li.li_tv.vval.v_string
        end, lis)
        -- Three watchers: pointing to first, middle and last elements.
        local lws = {
          list_watch(l, lis[1]),
          list_watch(l, lis[7]),
          list_watch(l, lis[13]),
        }
        alloc_log:clear()

        lib.tv_list_remove_items(l, lis[1], lis[3])
        eq({ '4', '5', '6', '7', '8', '9', '10', '11', '12', '13' }, typvalt2lua(l_tv))
        eq({ lis[4], lis[7], lis[13] }, { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item })
        alloc_log:check({
          a.freed(strings[1]),
          a.freed(lis[1]),
          a.freed(strings[2]),
          a.freed(lis[2]),
          a.freed(strings[3]),
          a.freed(lis[3]),
        })

        lib.tv_list_remove_items(l, lis[11], lis[13])
        eq({ '4', '5', '6', '7', '8', '9', '10' }, typvalt2lua(l_tv))
        eq(
          { lis[4], lis[7], nil },
          { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item == nil and nil }
        )
        alloc_log:check({
          a.freed(strings[11]),
          a.freed(lis[11]),
          a.freed(strings[12]),
          a.freed(lis[12]),
          a.freed(strings[13]),
          a.freed(lis[13]),
        })

        lib.tv_list_remove_items(l, lis[6], lis[8])
        eq({ '4', '5', '9', '10' }, typvalt2lua(l_tv))
        eq(
          { lis[4], lis[9], nil },
          { lws[1].lw_item, lws[2].lw_item, lws[3].lw_item == nil and nil }
        )
        alloc_log:check({
          a.freed(strings[6]),
          a.freed(lis[6]),
          a.freed(strings[7]),
          a.freed(lis[7]),
          a.freed(strings[8]),
          a.freed(lis[8]),
        })

        lib.tv_list_remove_items(l, lis[4], lis[10])
        eq(empty_list, typvalt2lua(l_tv))
        eq(
          { true, true, true },
          { lws[1].lw_item == nil, lws[2].lw_item == nil, lws[3].lw_item == nil }
        )
        alloc_log:check({
          a.freed(strings[4]),
          a.freed(lis[4]),
          a.freed(strings[5]),
          a.freed(lis[5]),
          a.freed(strings[9]),
          a.freed(lis[9]),
          a.freed(strings[10]),
          a.freed(lis[10]),
        })

        lib.tv_list_watch_remove(l, lws[1])
        lib.tv_list_watch_remove(l, lws[2])
        lib.tv_list_watch_remove(l, lws[3])

        alloc_log:check({})
      end)
    end)
    describe('insert', function()
      describe('()', function()
        itp('works', function()
          local l_tv = lua2typvalt({ 1, 2, 3, 4, 5, 6, 7 })
          local l = l_tv.vval.v_list
          local lis = list_items(l)
          local li

          li = li_alloc(true)
          li.li_tv = { v_type = lib.VAR_FLOAT, vval = { v_float = 100500 } }
          lib.tv_list_insert(l, li, nil)
          eq(l.lv_last, li)
          eq({ 1, 2, 3, 4, 5, 6, 7, 100500 }, typvalt2lua(l_tv))

          li = li_alloc(true)
          li.li_tv = { v_type = lib.VAR_FLOAT, vval = { v_float = 0 } }
          lib.tv_list_insert(l, li, lis[1])
          eq(l.lv_first, li)
          eq({ 0, 1, 2, 3, 4, 5, 6, 7, 100500 }, typvalt2lua(l_tv))

          li = li_alloc(true)
          li.li_tv = { v_type = lib.VAR_FLOAT, vval = { v_float = 4.5 } }
          lib.tv_list_insert(l, li, lis[5])
          eq(list_items(l)[6], li)
          eq({ 0, 1, 2, 3, 4, 4.5, 5, 6, 7, 100500 }, typvalt2lua(l_tv))
        end)
        itp('works with an empty list', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          eq(nil, l.lv_first)
          eq(nil, l.lv_last)

          local li = li_alloc(true)
          li.li_tv = { v_type = lib.VAR_FLOAT, vval = { v_float = 100500 } }
          lib.tv_list_insert(l, li, nil)
          eq(l.lv_last, li)
          eq({ 100500 }, typvalt2lua(l_tv))
        end)
      end)
      describe('tv()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          local l_l_tv = lua2typvalt(empty_list)
          alloc_log:clear()
          local l_l = l_l_tv.vval.v_list
          eq(1, l_l.lv_refcount)
          lib.tv_list_insert_tv(l, l_l_tv, nil)
          eq(2, l_l.lv_refcount)
          eq(l_l, l.lv_first.li_tv.vval.v_list)
          alloc_log:check({
            a.li(l.lv_first),
          })

          local l_s_tv = lua2typvalt('test')
          alloc_log:check({
            a.str(l_s_tv.vval.v_string, 'test'),
          })
          lib.tv_list_insert_tv(l, l_s_tv, l.lv_first)
          alloc_log:check({
            a.li(l.lv_first),
            a.str(l.lv_first.li_tv.vval.v_string, 'test'),
          })

          eq({ 'test', empty_list }, typvalt2lua(l_tv))
        end)
      end)
    end)
    describe('append', function()
      describe('list()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          local l_l = list(1)
          alloc_log:clear()
          eq(1, l_l.lv_refcount)
          lib.tv_list_append_list(l, l_l)
          eq(2, l_l.lv_refcount)
          eq(l_l, l.lv_first.li_tv.vval.v_list)
          alloc_log:check({
            a.li(l.lv_last),
          })

          lib.tv_list_append_list(l, nil)
          alloc_log:check({
            a.li(l.lv_last),
          })

          eq({ { 1 }, null_list }, typvalt2lua(l_tv))
        end)
      end)
      describe('dict()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          local l_d_tv = lua2typvalt({ test = 1 })
          local l_d = l_d_tv.vval.v_dict
          alloc_log:clear()
          eq(1, l_d.dv_refcount)
          lib.tv_list_append_dict(l, l_d)
          eq(2, l_d.dv_refcount)
          eq(l_d, l.lv_first.li_tv.vval.v_list)
          alloc_log:check({
            a.li(l.lv_last),
          })

          lib.tv_list_append_dict(l, nil)
          alloc_log:check({
            a.li(l.lv_last),
          })

          eq({ { test = 1 }, null_dict }, typvalt2lua(l_tv))
        end)
      end)
      describe('string()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          alloc_log:clear()
          lib.tv_list_append_string(l, 'test', 3)
          alloc_log:check({
            a.str(l.lv_last.li_tv.vval.v_string, 'tes'),
            a.li(l.lv_last),
          })

          lib.tv_list_append_string(l, nil, 0)
          alloc_log:check({
            a.li(l.lv_last),
          })

          lib.tv_list_append_string(l, nil, -1)
          alloc_log:check({
            a.li(l.lv_last),
          })

          lib.tv_list_append_string(l, 'test', -1)
          alloc_log:check({
            a.str(l.lv_last.li_tv.vval.v_string, 'test'),
            a.li(l.lv_last),
          })

          eq({ 'tes', null_string, null_string, 'test' }, typvalt2lua(l_tv))
        end)
      end)
      describe('allocated string()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          local s = lib.xstrdup('test')
          alloc_log:clear()
          lib.tv_list_append_allocated_string(l, s)
          alloc_log:check({
            a.li(l.lv_last),
          })

          lib.tv_list_append_allocated_string(l, nil)
          alloc_log:check({
            a.li(l.lv_last),
          })

          lib.tv_list_append_allocated_string(l, nil)
          alloc_log:check({
            a.li(l.lv_last),
          })

          eq({ 'test', null_string, null_string }, typvalt2lua(l_tv))
        end)
      end)
      describe('number()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          alloc_log:clear()
          lib.tv_list_append_number(l, -100500)
          alloc_log:check({
            a.li(l.lv_last),
          })

          lib.tv_list_append_number(l, 100500)
          alloc_log:check({
            a.li(l.lv_last),
          })

          eq({ int(-100500), int(100500) }, typvalt2lua(l_tv))
        end)
      end)
      describe('tv()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          local l_l_tv = lua2typvalt(empty_list)
          alloc_log:clear()
          local l_l = l_l_tv.vval.v_list
          eq(1, l_l.lv_refcount)
          lib.tv_list_append_tv(l, l_l_tv)
          eq(2, l_l.lv_refcount)
          eq(l_l, l.lv_first.li_tv.vval.v_list)
          alloc_log:check({
            a.li(l.lv_first),
          })

          local l_s_tv = lua2typvalt('test')
          alloc_log:check({
            a.str(l_s_tv.vval.v_string, 'test'),
          })
          lib.tv_list_append_tv(l, l_s_tv)
          alloc_log:check({
            a.li(l.lv_last),
            a.str(l.lv_last.li_tv.vval.v_string, 'test'),
          })

          eq({ empty_list, 'test' }, typvalt2lua(l_tv))
        end)
      end)
      describe('owned tv()', function()
        itp('works', function()
          local l_tv = lua2typvalt(empty_list)
          local l = l_tv.vval.v_list

          local l_l_tv = lua2typvalt(empty_list)
          alloc_log:clear()
          local l_l = l_l_tv.vval.v_list
          eq(1, l_l.lv_refcount)
          lib.tv_list_append_owned_tv(l, l_l_tv)
          eq(1, l_l.lv_refcount)
          l_l.lv_refcount = l_l.lv_refcount + 1
          eq(l_l, l.lv_first.li_tv.vval.v_list)
          alloc_log:check({
            a.li(l.lv_first),
          })

          local l_s_tv = ffi.gc(lua2typvalt('test'), nil)
          alloc_log:check({
            a.str(l_s_tv.vval.v_string, 'test'),
          })
          lib.tv_list_append_owned_tv(l, l_s_tv)
          eq(l_s_tv.vval.v_string, l.lv_last.li_tv.vval.v_string)
          l_s_tv.vval.v_string = nil
          alloc_log:check({
            a.li(l.lv_last),
          })

          eq({ empty_list, 'test' }, typvalt2lua(l_tv))
        end)
      end)
    end)
    describe('copy()', function()
      local function tv_list_copy(...)
        return ffi.gc(lib.tv_list_copy(...), lib.tv_list_unref)
      end
      itp('copies NULL correctly', function()
        eq(nil, lib.tv_list_copy(nil, nil, true, 0))
        eq(nil, lib.tv_list_copy(nil, nil, false, 0))
        eq(nil, lib.tv_list_copy(nil, nil, true, 1))
        eq(nil, lib.tv_list_copy(nil, nil, false, 1))
      end)
      itp('copies list correctly without converting items', function()
        do
          local v = { { ['«'] = '»' }, { '„' }, 1, '“', null_string, null_list, null_dict }
          local l_tv = lua2typvalt(v)
          local l = l_tv.vval.v_list
          local lis = list_items(l)
          alloc_log:clear()

          eq(1, lis[1].li_tv.vval.v_dict.dv_refcount)
          eq(1, lis[2].li_tv.vval.v_list.lv_refcount)
          local l_copy1 = tv_list_copy(nil, l, false, 0)
          eq(2, lis[1].li_tv.vval.v_dict.dv_refcount)
          eq(2, lis[2].li_tv.vval.v_list.lv_refcount)
          local lis_copy1 = list_items(l_copy1)
          eq(lis[1].li_tv.vval.v_dict, lis_copy1[1].li_tv.vval.v_dict)
          eq(lis[2].li_tv.vval.v_list, lis_copy1[2].li_tv.vval.v_list)
          eq(v, lst2tbl(l_copy1))
          alloc_log:check({
            a.list(l_copy1),
            a.li(lis_copy1[1]),
            a.li(lis_copy1[2]),
            a.li(lis_copy1[3]),
            a.li(lis_copy1[4]),
            a.str(lis_copy1[4].li_tv.vval.v_string, #v[4]),
            a.li(lis_copy1[5]),
            a.li(lis_copy1[6]),
            a.li(lis_copy1[7]),
          })
          lib.tv_list_free(ffi.gc(l_copy1, nil))
          alloc_log:clear()

          eq(1, lis[1].li_tv.vval.v_dict.dv_refcount)
          eq(1, lis[2].li_tv.vval.v_list.lv_refcount)
          local l_deepcopy1 = tv_list_copy(nil, l, true, 0)
          neq(nil, l_deepcopy1)
          eq(1, lis[1].li_tv.vval.v_dict.dv_refcount)
          eq(1, lis[2].li_tv.vval.v_list.lv_refcount)
          local lis_deepcopy1 = list_items(l_deepcopy1)
          neq(lis[1].li_tv.vval.v_dict, lis_deepcopy1[1].li_tv.vval.v_dict)
          neq(lis[2].li_tv.vval.v_list, lis_deepcopy1[2].li_tv.vval.v_list)
          eq(v, lst2tbl(l_deepcopy1))
          local di_deepcopy1 = first_di(lis_deepcopy1[1].li_tv.vval.v_dict)
          alloc_log:check({
            a.list(l_deepcopy1),
            a.li(lis_deepcopy1[1]),
            a.dict(lis_deepcopy1[1].li_tv.vval.v_dict),
            a.di(di_deepcopy1, #'«'),
            a.str(di_deepcopy1.di_tv.vval.v_string, #v[1]['«']),
            a.li(lis_deepcopy1[2]),
            a.list(lis_deepcopy1[2].li_tv.vval.v_list),
            a.li(lis_deepcopy1[2].li_tv.vval.v_list.lv_first),
            a.str(lis_deepcopy1[2].li_tv.vval.v_list.lv_first.li_tv.vval.v_string, #v[2][1]),
            a.li(lis_deepcopy1[3]),
            a.li(lis_deepcopy1[4]),
            a.str(lis_deepcopy1[4].li_tv.vval.v_string, #v[4]),
            a.li(lis_deepcopy1[5]),
            a.li(lis_deepcopy1[6]),
            a.li(lis_deepcopy1[7]),
          })
        end
        collectgarbage()
      end)
      itp('copies list correctly and converts items', function()
        local vc = vimconv_alloc()
        -- UTF-8 ↔ latin1 conversions needs no iconv
        eq(OK, lib.convert_setup(vc, to_cstr('utf-8'), to_cstr('latin1')))

        local v = { { ['«'] = '»' }, { '„' }, 1, '“', null_string, null_list, null_dict }
        local l_tv = lua2typvalt(v)
        local l = l_tv.vval.v_list
        local lis = list_items(l)
        alloc_log:clear()

        eq(1, lis[1].li_tv.vval.v_dict.dv_refcount)
        eq(1, lis[2].li_tv.vval.v_list.lv_refcount)
        local l_deepcopy1 = tv_list_copy(vc, l, true, 0)
        neq(nil, l_deepcopy1)
        eq(1, lis[1].li_tv.vval.v_dict.dv_refcount)
        eq(1, lis[2].li_tv.vval.v_list.lv_refcount)
        local lis_deepcopy1 = list_items(l_deepcopy1)
        neq(lis[1].li_tv.vval.v_dict, lis_deepcopy1[1].li_tv.vval.v_dict)
        neq(lis[2].li_tv.vval.v_list, lis_deepcopy1[2].li_tv.vval.v_list)
        eq(
          { { ['\171'] = '\187' }, { '\191' }, 1, '\191', null_string, null_list, null_dict },
          lst2tbl(l_deepcopy1)
        )
        local di_deepcopy1 = first_di(lis_deepcopy1[1].li_tv.vval.v_dict)
        alloc_log:clear_tmp_allocs()
        alloc_log:check({
          a.list(l_deepcopy1),
          a.li(lis_deepcopy1[1]),
          a.dict(lis_deepcopy1[1].li_tv.vval.v_dict),
          a.di(di_deepcopy1, 1),
          a.str(di_deepcopy1.di_tv.vval.v_string, 2),
          a.li(lis_deepcopy1[2]),
          a.list(lis_deepcopy1[2].li_tv.vval.v_list),
          a.li(lis_deepcopy1[2].li_tv.vval.v_list.lv_first),
          a.str(lis_deepcopy1[2].li_tv.vval.v_list.lv_first.li_tv.vval.v_string, #v[2][1]),
          a.li(lis_deepcopy1[3]),
          a.li(lis_deepcopy1[4]),
          a.str(lis_deepcopy1[4].li_tv.vval.v_string, #v[4]),
          a.li(lis_deepcopy1[5]),
          a.li(lis_deepcopy1[6]),
          a.li(lis_deepcopy1[7]),
        })
      end)
      itp('returns different/same containers with(out) copyID', function()
        local l_inner_tv = lua2typvalt(empty_list)
        local l_tv = lua2typvalt({ l_inner_tv, l_inner_tv })
        eq(3, l_inner_tv.vval.v_list.lv_refcount)
        local l = l_tv.vval.v_list
        eq(l.lv_first.li_tv.vval.v_list, l.lv_last.li_tv.vval.v_list)

        local l_copy1 = tv_list_copy(nil, l, true, 0)
        neq(l_copy1.lv_first.li_tv.vval.v_list, l_copy1.lv_last.li_tv.vval.v_list)
        eq({ empty_list, empty_list }, lst2tbl(l_copy1))

        local l_copy2 = tv_list_copy(nil, l, true, 2)
        eq(l_copy2.lv_first.li_tv.vval.v_list, l_copy2.lv_last.li_tv.vval.v_list)
        eq({ empty_list, empty_list }, lst2tbl(l_copy2))

        eq(3, l_inner_tv.vval.v_list.lv_refcount)
      end)
      itp('works with self-referencing list with copyID', function()
        local l_tv = lua2typvalt(empty_list)
        local l = l_tv.vval.v_list
        eq(1, l.lv_refcount)
        lib.tv_list_append_list(l, l)
        eq(2, l.lv_refcount)

        local l_copy1 = tv_list_copy(nil, l, true, 2)
        eq(2, l_copy1.lv_refcount)
        local v = {}
        v[1] = v
        eq(v, lst2tbl(l_copy1))

        local lis = list_items(l)
        lib.tv_list_item_remove(l, lis[1])
        eq(1, l.lv_refcount)

        local lis_copy1 = list_items(l_copy1)
        lib.tv_list_item_remove(l_copy1, lis_copy1[1])
        eq(1, l_copy1.lv_refcount)
      end)
    end)
    describe('extend()', function()
      itp('can extend list with itself', function()
        local l

        l = list(1, {})
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        lib.tv_list_extend(l, l, nil)
        alloc_log:check({
          a.li(l.lv_last.li_prev),
          a.li(l.lv_last),
        })
        eq(1, l.lv_refcount)
        eq(2, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq({ 1, {}, 1, {} }, lst2tbl(l))

        l = list(1, {})
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        lib.tv_list_extend(l, l, l.lv_last)
        alloc_log:check({
          a.li(l.lv_last.li_prev.li_prev),
          a.li(l.lv_last.li_prev),
        })
        eq({ 1, 1, {}, {} }, lst2tbl(l))
        eq(1, l.lv_refcount)
        eq(2, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        l = list(1, {})
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        lib.tv_list_extend(l, l, l.lv_first)
        alloc_log:check({
          a.li(l.lv_first),
          a.li(l.lv_first.li_next),
        })
        eq({ 1, {}, 1, {} }, lst2tbl(l))
        eq(1, l.lv_refcount)
        eq(2, l.lv_last.li_tv.vval.v_dict.dv_refcount)
      end)
      itp('can extend list with an empty list', function()
        local l = list(1, {})
        local el = list()
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, el.lv_refcount)

        lib.tv_list_extend(l, el, nil)
        alloc_log:check({})
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, el.lv_refcount)
        eq({ 1, {} }, lst2tbl(l))

        lib.tv_list_extend(l, el, l.lv_first)
        alloc_log:check({})
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, el.lv_refcount)
        eq({ 1, {} }, lst2tbl(l))

        lib.tv_list_extend(l, el, l.lv_last)
        alloc_log:check({})
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, el.lv_refcount)
        eq({ 1, {} }, lst2tbl(l))
      end)
      itp('can extend list with another non-empty list', function()
        local l
        local l2 = list(42, empty_list)
        eq(1, l2.lv_refcount)
        eq(1, l2.lv_last.li_tv.vval.v_list.lv_refcount)

        l = ffi.gc(list(1, {}), nil)
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        lib.tv_list_extend(l, l2, nil)
        alloc_log:check({
          a.li(l.lv_last.li_prev),
          a.li(l.lv_last),
        })
        eq(1, l2.lv_refcount)
        eq(2, l2.lv_last.li_tv.vval.v_list.lv_refcount)
        eq({ 1, {}, 42, empty_list }, lst2tbl(l))
        lib.tv_list_free(l)
        eq(1, l2.lv_last.li_tv.vval.v_list.lv_refcount)

        l = ffi.gc(list(1, {}), nil)
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        lib.tv_list_extend(l, l2, l.lv_first)
        alloc_log:check({
          a.li(l.lv_first),
          a.li(l.lv_first.li_next),
        })
        eq(1, l2.lv_refcount)
        eq(2, l2.lv_last.li_tv.vval.v_list.lv_refcount)
        eq({ 42, empty_list, 1, {} }, lst2tbl(l))
        lib.tv_list_free(l)
        eq(1, l2.lv_last.li_tv.vval.v_list.lv_refcount)

        l = ffi.gc(list(1, {}), nil)
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        lib.tv_list_extend(l, l2, l.lv_last)
        alloc_log:check({
          a.li(l.lv_first.li_next),
          a.li(l.lv_first.li_next.li_next),
        })
        eq(1, l2.lv_refcount)
        eq(2, l2.lv_last.li_tv.vval.v_list.lv_refcount)
        eq({ 1, 42, empty_list, {} }, lst2tbl(l))
        lib.tv_list_free(l)
        eq(1, l2.lv_last.li_tv.vval.v_list.lv_refcount)
      end)
    end)
    describe('concat()', function()
      itp('works with NULL lists', function()
        local l = list(1, {})
        alloc_log:clear()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        local rettv1 = typvalt()
        eq(OK, lib.tv_list_concat(nil, l, rettv1))
        eq(1, l.lv_refcount)
        eq(tonumber(lib.VAR_LIST), tonumber(rettv1.v_type))
        eq({ 1, {} }, typvalt2lua(rettv1))
        eq(1, rettv1.vval.v_list.lv_refcount)
        alloc_log:check({
          a.list(rettv1.vval.v_list),
          a.li(rettv1.vval.v_list.lv_first),
          a.li(rettv1.vval.v_list.lv_last),
        })
        eq(2, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        local rettv2 = typvalt()
        eq(OK, lib.tv_list_concat(l, nil, rettv2))
        eq(1, l.lv_refcount)
        eq(tonumber(lib.VAR_LIST), tonumber(rettv2.v_type))
        eq({ 1, {} }, typvalt2lua(rettv2))
        eq(1, rettv2.vval.v_list.lv_refcount)
        alloc_log:check({
          a.list(rettv2.vval.v_list),
          a.li(rettv2.vval.v_list.lv_first),
          a.li(rettv2.vval.v_list.lv_last),
        })
        eq(3, l.lv_last.li_tv.vval.v_dict.dv_refcount)

        local rettv3 = typvalt()
        eq(OK, lib.tv_list_concat(nil, nil, rettv3))
        eq(tonumber(lib.VAR_LIST), tonumber(rettv3.v_type))
        eq(null_list, typvalt2lua(rettv3))
        alloc_log:check({})
      end)
      itp('works with two different lists', function()
        local l1 = list(1, {})
        local l2 = list(3, empty_list)
        eq(1, l1.lv_refcount)
        eq(1, l1.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, l2.lv_refcount)
        eq(1, l2.lv_last.li_tv.vval.v_list.lv_refcount)
        alloc_log:clear()

        local rettv = typvalt()
        eq(OK, lib.tv_list_concat(l1, l2, rettv))
        eq(1, l1.lv_refcount)
        eq(2, l1.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, l2.lv_refcount)
        eq(2, l2.lv_last.li_tv.vval.v_list.lv_refcount)
        alloc_log:check({
          a.list(rettv.vval.v_list),
          a.li(rettv.vval.v_list.lv_first),
          a.li(rettv.vval.v_list.lv_first.li_next),
          a.li(rettv.vval.v_list.lv_last.li_prev),
          a.li(rettv.vval.v_list.lv_last),
        })
        eq({ 1, {}, 3, empty_list }, typvalt2lua(rettv))
      end)
      itp('can concatenate list with itself', function()
        local l = list(1, {})
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        alloc_log:clear()

        local rettv = typvalt()
        eq(OK, lib.tv_list_concat(l, l, rettv))
        eq(1, l.lv_refcount)
        eq(3, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        alloc_log:check({
          a.list(rettv.vval.v_list),
          a.li(rettv.vval.v_list.lv_first),
          a.li(rettv.vval.v_list.lv_first.li_next),
          a.li(rettv.vval.v_list.lv_last.li_prev),
          a.li(rettv.vval.v_list.lv_last),
        })
        eq({ 1, {}, 1, {} }, typvalt2lua(rettv))
      end)
      itp('can concatenate empty non-NULL lists', function()
        local l = list(1, {})
        local le = list()
        local le2 = list()
        eq(1, l.lv_refcount)
        eq(1, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, le.lv_refcount)
        eq(1, le2.lv_refcount)
        alloc_log:clear()

        local rettv1 = typvalt()
        eq(OK, lib.tv_list_concat(l, le, rettv1))
        eq(1, l.lv_refcount)
        eq(2, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, le.lv_refcount)
        eq(1, le2.lv_refcount)
        alloc_log:check({
          a.list(rettv1.vval.v_list),
          a.li(rettv1.vval.v_list.lv_first),
          a.li(rettv1.vval.v_list.lv_last),
        })
        eq({ 1, {} }, typvalt2lua(rettv1))

        local rettv2 = typvalt()
        eq(OK, lib.tv_list_concat(le, l, rettv2))
        eq(1, l.lv_refcount)
        eq(3, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, le.lv_refcount)
        eq(1, le2.lv_refcount)
        alloc_log:check({
          a.list(rettv2.vval.v_list),
          a.li(rettv2.vval.v_list.lv_first),
          a.li(rettv2.vval.v_list.lv_last),
        })
        eq({ 1, {} }, typvalt2lua(rettv2))

        local rettv3 = typvalt()
        eq(OK, lib.tv_list_concat(le, le, rettv3))
        eq(1, l.lv_refcount)
        eq(3, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, le.lv_refcount)
        eq(1, le2.lv_refcount)
        alloc_log:check({
          a.list(rettv3.vval.v_list),
        })
        eq(empty_list, typvalt2lua(rettv3))

        local rettv4 = typvalt()
        eq(OK, lib.tv_list_concat(le, le2, rettv4))
        eq(1, l.lv_refcount)
        eq(3, l.lv_last.li_tv.vval.v_dict.dv_refcount)
        eq(1, le.lv_refcount)
        eq(1, le2.lv_refcount)
        alloc_log:check({
          a.list(rettv4.vval.v_list),
        })
        eq(empty_list, typvalt2lua(rettv4))
      end)
    end)
    describe('join()', function()
      local function list_join(l, sep, join_ret)
        local ga = ga_alloc()
        eq(join_ret or OK, lib.tv_list_join(ga, l, sep))
        local ret = ''
        if ga.ga_data ~= nil then
          ret = ffi.string(ga.ga_data)
        end
        -- For some reason this is not working well in GC
        lib.ga_clear(ffi.gc(ga, nil))
        return ret
      end
      itp('works', function()
        local l
        l = list('boo', 'far')
        eq('boo far', list_join(l, ' '))
        eq('boofar', list_join(l, ''))

        l = list('boo')
        eq('boo', list_join(l, ' '))

        l = list()
        eq('', list_join(l, ' '))

        l = list({}, 'far')
        eq('{} far', list_join(l, ' '))

        local recursive_list = {}
        recursive_list[1] = recursive_list
        l = ffi.gc(list(recursive_list, 'far'), nil)
        eq('[[...@0]] far', list_join(l, ' '))

        local recursive_l = l.lv_first.li_tv.vval.v_list
        local recursive_li = recursive_l.lv_first
        lib.tv_list_item_remove(recursive_l, recursive_li)
        lib.tv_list_free(l)
      end)
    end)
    describe('equal()', function()
      itp('compares empty and NULL lists correctly', function()
        local l = list()
        local l2 = list()

        -- NULL lists are equal to empty lists
        eq(true, lib.tv_list_equal(l, nil, true))
        eq(true, lib.tv_list_equal(nil, l, false))

        -- NULL lists are equal themselves
        eq(true, lib.tv_list_equal(nil, nil, true))
        eq(true, lib.tv_list_equal(nil, nil, false))

        -- As well as empty lists
        eq(true, lib.tv_list_equal(l, l, true))
        eq(true, lib.tv_list_equal(l, l2, false))
        eq(true, lib.tv_list_equal(l2, l, false))
        eq(true, lib.tv_list_equal(l2, l2, true))
      end)
      itp('compares lists correctly when case is not ignored', function()
        local l1 = list('abc', { 1, 2, 'Abc' }, 'def')
        local l2 = list('abc', { 1, 2, 'Abc' })
        local l3 = list('abc', { 1, 2, 'Abc' }, 'Def')
        local l4 = list('abc', { 1, 2, 'Abc', 4 }, 'def')
        local l5 = list('Abc', { 1, 2, 'Abc' }, 'def')
        local l6 = list('abc', { 1, 2, 'Abc' }, 'def')
        local l7 = list('abc', { 1, 2, 'abc' }, 'def')
        local l8 = list('abc', nil, 'def')
        local l9 = list('abc', { 1, 2, nil }, 'def')

        eq(true, lib.tv_list_equal(l1, l1, false))
        eq(false, lib.tv_list_equal(l1, l2, false))
        eq(false, lib.tv_list_equal(l1, l3, false))
        eq(false, lib.tv_list_equal(l1, l4, false))
        eq(false, lib.tv_list_equal(l1, l5, false))
        eq(true, lib.tv_list_equal(l1, l6, false))
        eq(false, lib.tv_list_equal(l1, l7, false))
        eq(false, lib.tv_list_equal(l1, l8, false))
        eq(false, lib.tv_list_equal(l1, l9, false))
      end)
      itp('compares lists correctly when case is ignored', function()
        local l1 = list('abc', { 1, 2, 'Abc' }, 'def')
        local l2 = list('abc', { 1, 2, 'Abc' })
        local l3 = list('abc', { 1, 2, 'Abc' }, 'Def')
        local l4 = list('abc', { 1, 2, 'Abc', 4 }, 'def')
        local l5 = list('Abc', { 1, 2, 'Abc' }, 'def')
        local l6 = list('abc', { 1, 2, 'Abc' }, 'def')
        local l7 = list('abc', { 1, 2, 'abc' }, 'def')
        local l8 = list('abc', nil, 'def')
        local l9 = list('abc', { 1, 2, nil }, 'def')

        eq(true, lib.tv_list_equal(l1, l1, true))
        eq(false, lib.tv_list_equal(l1, l2, true))
        eq(true, lib.tv_list_equal(l1, l3, true))
        eq(false, lib.tv_list_equal(l1, l4, true))
        eq(true, lib.tv_list_equal(l1, l5, true))
        eq(true, lib.tv_list_equal(l1, l6, true))
        eq(true, lib.tv_list_equal(l1, l7, true))
        eq(false, lib.tv_list_equal(l1, l8, true))
        eq(false, lib.tv_list_equal(l1, l9, true))
      end)
    end)
    describe('find', function()
      describe('()', function()
        itp('correctly indexes list', function()
          local l = list(1, 2, 3, 4, 5)
          local lis = list_items(l)
          alloc_log:clear()

          eq(nil, lib.tv_list_find(nil, -1))
          eq(nil, lib.tv_list_find(nil, 0))
          eq(nil, lib.tv_list_find(nil, 1))

          eq(nil, lib.tv_list_find(l, 5))
          eq(nil, lib.tv_list_find(l, -6))
          eq(lis[1], lib.tv_list_find(l, -5))
          eq(lis[5], lib.tv_list_find(l, 4))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, -3))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, -3))

          l.lv_idx_item = nil
          eq(lis[1], lib.tv_list_find(l, -5))
          l.lv_idx_item = nil
          eq(lis[5], lib.tv_list_find(l, 4))
          l.lv_idx_item = nil
          eq(lis[3], lib.tv_list_find(l, 2))
          l.lv_idx_item = nil
          eq(lis[3], lib.tv_list_find(l, -3))
          l.lv_idx_item = nil
          eq(lis[3], lib.tv_list_find(l, 2))
          l.lv_idx_item = nil
          eq(lis[3], lib.tv_list_find(l, 2))
          l.lv_idx_item = nil
          eq(lis[3], lib.tv_list_find(l, -3))

          l.lv_idx_item = nil
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[1], lib.tv_list_find(l, -5))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[5], lib.tv_list_find(l, 4))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, -3))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, 2))
          eq(lis[3], lib.tv_list_find(l, -3))

          alloc_log:check({})
        end)
      end)
      describe('nr()', function()
        local function tv_list_find_nr(l, n, msg)
          return check_emsg(function()
            local err = ffi.new('bool[1]', { false })
            local ret = lib.tv_list_find_nr(l, n, err)
            return (err[0] == true), ret
          end, msg)
        end
        itp('returns correct number', function()
          local l = list(int(1), int(2), int(3), int(4), int(5))
          alloc_log:clear()

          eq({ false, 1 }, { tv_list_find_nr(l, -5) })
          eq({ false, 5 }, { tv_list_find_nr(l, 4) })
          eq({ false, 3 }, { tv_list_find_nr(l, 2) })
          eq({ false, 3 }, { tv_list_find_nr(l, -3) })

          alloc_log:check({})
        end)
        itp('returns correct number when given a string', function()
          local l = list('1', '2', '3', '4', '5')
          alloc_log:clear()

          eq({ false, 1 }, { tv_list_find_nr(l, -5) })
          eq({ false, 5 }, { tv_list_find_nr(l, 4) })
          eq({ false, 3 }, { tv_list_find_nr(l, 2) })
          eq({ false, 3 }, { tv_list_find_nr(l, -3) })

          alloc_log:check({})
        end)
        itp('returns zero when given a NULL string', function()
          local l = list(null_string)
          alloc_log:clear()

          eq({ false, 0 }, { tv_list_find_nr(l, 0) })

          alloc_log:check({})
        end)
        itp('errors out on NULL lists', function()
          eq({ true, -1 }, { tv_list_find_nr(nil, -5) })
          eq({ true, -1 }, { tv_list_find_nr(nil, 4) })
          eq({ true, -1 }, { tv_list_find_nr(nil, 2) })
          eq({ true, -1 }, { tv_list_find_nr(nil, -3) })

          alloc_log:check({})
        end)
        itp('errors out on out-of-range indexes', function()
          local l = list(int(1), int(2), int(3), int(4), int(5))
          alloc_log:clear()

          eq({ true, -1 }, { tv_list_find_nr(l, -6) })
          eq({ true, -1 }, { tv_list_find_nr(l, 5) })

          alloc_log:check({})
        end)
        itp('errors out on invalid types', function()
          local l = list(1, empty_list, {})

          eq({ true, 0 }, { tv_list_find_nr(l, 0, 'E805: Using a Float as a Number') })
          eq({ true, 0 }, { tv_list_find_nr(l, 1, 'E745: Using a List as a Number') })
          eq({ true, 0 }, { tv_list_find_nr(l, 2, 'E728: Using a Dictionary as a Number') })
          eq({ true, 0 }, { tv_list_find_nr(l, -1, 'E728: Using a Dictionary as a Number') })
          eq({ true, 0 }, { tv_list_find_nr(l, -2, 'E745: Using a List as a Number') })
          eq({ true, 0 }, { tv_list_find_nr(l, -3, 'E805: Using a Float as a Number') })
        end)
      end)
      local function tv_list_find_str(l, n, msg)
        return check_emsg(function()
          local ret = lib.tv_list_find_str(l, n)
          local s = nil
          if ret ~= nil then
            s = ffi.string(ret)
          end
          return s
        end, msg)
      end
      describe('str()', function()
        itp('returns correct string', function()
          local l = list(int(1), 2.5, int(3), int(4), int(5))
          alloc_log:clear()

          eq('1', tv_list_find_str(l, -5))
          eq('2.5', tv_list_find_str(l, 1))
          eq('5', tv_list_find_str(l, 4))
          eq('3', tv_list_find_str(l, 2))
          eq('3', tv_list_find_str(l, -3))

          alloc_log:check({ a.freed(alloc_log.null), a.freed(alloc_log.null) })
        end)
        itp('returns string when used with VAR_STRING items', function()
          local l = list('1', '2', '3', '4', '5')
          alloc_log:clear()

          eq('1', tv_list_find_str(l, -5))
          eq('5', tv_list_find_str(l, 4))
          eq('3', tv_list_find_str(l, 2))
          eq('3', tv_list_find_str(l, -3))

          alloc_log:check({})
        end)
        itp('returns empty when used with NULL string', function()
          local l = list(null_string)
          alloc_log:clear()

          eq('', tv_list_find_str(l, 0))

          alloc_log:check({})
        end)
        itp('fails with error message when index is out of range', function()
          local l = list(int(1), int(2), int(3), int(4), int(5))

          eq(nil, tv_list_find_str(l, -6, 'E684: List index out of range: -6'))
          eq(nil, tv_list_find_str(l, 5, 'E684: List index out of range: 5'))
        end)
        itp('fails with error message on invalid types', function()
          local l = list(empty_list, {})

          eq('', tv_list_find_str(l, 0, 'E730: Using a List as a String'))
          eq('', tv_list_find_str(l, 1, 'E731: Using a Dictionary as a String'))
          eq('', tv_list_find_str(l, -1, 'E731: Using a Dictionary as a String'))
          eq('', tv_list_find_str(l, -2, 'E730: Using a List as a String'))
        end)
      end)
    end)
    describe('idx_of_item()', function()
      itp('works', function()
        local l = list(1, 2, 3, 4, 5)
        local l2 = list(42, empty_list)
        local lis = list_items(l)
        local lis2 = list_items(l2)

        for i, li in ipairs(lis) do
          eq(i - 1, lib.tv_list_idx_of_item(l, li))
        end
        eq(-1, lib.tv_list_idx_of_item(l, lis2[1]))
        eq(-1, lib.tv_list_idx_of_item(l, nil))
        eq(-1, lib.tv_list_idx_of_item(nil, nil))
        eq(-1, lib.tv_list_idx_of_item(nil, lis[1]))
      end)
    end)
  end)
  describe('dict', function()
    describe('watcher', function()
      describe('add()/remove()', function()
        itp('works with an empty key', function()
          local d = dict({})
          eq({}, dict_watchers(d))
          local cb = ffi.gc(tbl2callback({ type = 'none' }), nil)
          alloc_log:clear()
          lib.tv_dict_watcher_add(d, '*', 0, cb[0])
          local ws, qs = dict_watchers(d)
          local key_p = qs[1].key_pattern
          alloc_log:check({
            a.dwatcher(qs[1]),
            a.str(key_p, 0),
          })
          eq({ { busy = false, cb = { type = 'none' }, pat = '' } }, ws)
          eq(true, lib.tv_dict_watcher_remove(d, 'x', 0, cb[0]))
          alloc_log:check({
            a.freed(key_p),
            a.freed(qs[1]),
          })
          eq({}, dict_watchers(d))
        end)
        itp('works with multiple callbacks', function()
          local d = dict({})
          eq({}, dict_watchers(d))
          alloc_log:check({ a.dict(d) })
          local cbs = {}
          cbs[1] = { 'te', ffi.gc(tbl2callback({ type = 'none' }), nil) }
          alloc_log:check({})
          cbs[2] = { 'foo', ffi.gc(tbl2callback({ type = 'fref', fref = 'tr' }), nil) }
          alloc_log:check({
            a.str(cbs[2][2].data.funcref, #'tr'),
          })
          cbs[3] = {
            'te',
            ffi.gc(
              tbl2callback({
                type = 'pt',
                fref = 'tr',
                pt = {
                  value = 'tr',
                  args = { 'test' },
                  dict = {},
                },
              }),
              nil
            ),
          }
          local pt3 = cbs[3][2].data.partial
          local pt3_argv = pt3.pt_argv
          local pt3_dict = pt3.pt_dict
          local pt3_name = pt3.pt_name
          local pt3_str_arg = pt3.pt_argv[0].vval.v_string
          alloc_log:check({
            a.lua_pt(pt3),
            a.lua_tvs(pt3_argv, pt3.pt_argc),
            a.str(pt3_str_arg, #'test'),
            a.dict(pt3_dict),
            a.str(pt3_name, #'tr'),
          })
          for _, v in ipairs(cbs) do
            lib.tv_dict_watcher_add(d, v[1], #v[1], v[2][0])
          end
          local ws, qs, kps = dict_watchers(d)
          eq({
            { busy = false, pat = cbs[1][1], cb = { type = 'none' } },
            { busy = false, pat = cbs[2][1], cb = { type = 'fref', fref = 'tr' } },
            {
              busy = false,
              pat = cbs[3][1],
              cb = {
                type = 'pt',
                fref = 'tr',
                pt = {
                  [type_key] = func_type,
                  value = 'tr',
                  args = { 'test' },
                  dict = {},
                },
              },
            },
          }, ws)
          alloc_log:check({
            a.dwatcher(qs[1]),
            a.str(kps[1][1], kps[1][2]),
            a.dwatcher(qs[2]),
            a.str(kps[2][1], kps[2][2]),
            a.dwatcher(qs[3]),
            a.str(kps[3][1], kps[3][2]),
          })
          eq(true, lib.tv_dict_watcher_remove(d, cbs[2][1], #cbs[2][1], cbs[2][2][0]))
          alloc_log:check({
            a.freed(cbs[2][2].data.funcref),
            a.freed(kps[2][1]),
            a.freed(qs[2]),
          })
          eq(false, lib.tv_dict_watcher_remove(d, cbs[2][1], #cbs[2][1], cbs[2][2][0]))
          eq({
            { busy = false, pat = cbs[1][1], cb = { type = 'none' } },
            {
              busy = false,
              pat = cbs[3][1],
              cb = {
                type = 'pt',
                fref = 'tr',
                pt = {
                  [type_key] = func_type,
                  value = 'tr',
                  args = { 'test' },
                  dict = {},
                },
              },
            },
          }, dict_watchers(d))
          eq(true, lib.tv_dict_watcher_remove(d, cbs[3][1], #cbs[3][1], cbs[3][2][0]))
          alloc_log:check({
            a.freed(pt3_str_arg),
            a.freed(pt3_argv),
            a.freed(pt3_dict),
            a.freed(pt3_name),
            a.freed(pt3),
            a.freed(kps[3][1]),
            a.freed(qs[3]),
          })
          eq(false, lib.tv_dict_watcher_remove(d, cbs[3][1], #cbs[3][1], cbs[3][2][0]))
          eq({ { busy = false, pat = cbs[1][1], cb = { type = 'none' } } }, dict_watchers(d))
          eq(true, lib.tv_dict_watcher_remove(d, cbs[1][1], #cbs[1][1], cbs[1][2][0]))
          alloc_log:check({
            a.freed(kps[1][1]),
            a.freed(qs[1]),
          })
          eq(false, lib.tv_dict_watcher_remove(d, cbs[1][1], #cbs[1][1], cbs[1][2][0]))
          eq({}, dict_watchers(d))
        end)
      end)
      describe('notify', function()
        -- Way too hard to test it here, functional tests in
        -- dict_notifications_spec.lua.
      end)
    end)
    describe('item', function()
      describe('alloc()/free()', function()
        local function check_tv_dict_item_alloc_len(s, len, tv, more_frees)
          local di
          if len == nil then
            di = ffi.gc(lib.tv_dict_item_alloc(s), nil)
            len = #s
          else
            di = ffi.gc(lib.tv_dict_item_alloc_len(s, len or #s), nil)
          end
          eq(s:sub(1, len), ffi.string(di.di_key))
          alloc_log:check({ a.di(di, len) })
          if tv then
            di.di_tv = ffi.gc(tv, nil)
          else
            di.di_tv.v_type = lib.VAR_UNKNOWN
          end
          lib.tv_dict_item_free(di)
          alloc_log:check(concat_tables(more_frees, { a.freed(di) }))
        end
        local function check_tv_dict_item_alloc(s, tv, more_frees)
          return check_tv_dict_item_alloc_len(s, nil, tv, more_frees)
        end
        itp('works', function()
          check_tv_dict_item_alloc('')
          check_tv_dict_item_alloc('t')
          check_tv_dict_item_alloc('TEST')
          check_tv_dict_item_alloc_len('', 0)
          check_tv_dict_item_alloc_len('TEST', 2)
          local tv = lua2typvalt('test')
          alloc_log:check({ a.str(tv.vval.v_string, #'test') })
          check_tv_dict_item_alloc('', tv, { a.freed(tv.vval.v_string) })
          tv = lua2typvalt('test')
          alloc_log:check({ a.str(tv.vval.v_string, #'test') })
          check_tv_dict_item_alloc_len('', 0, tv, { a.freed(tv.vval.v_string) })
        end)
      end)
      describe('add()/remove()', function()
        itp('works', function()
          local d = dict()
          eq({}, dct2tbl(d))
          alloc_log:check({ a.dict(d) })
          local di = ffi.gc(lib.tv_dict_item_alloc(''), nil)
          local tv = lua2typvalt('test')
          di.di_tv = ffi.gc(tv, nil)
          alloc_log:check({ a.di(di, ''), a.str(tv.vval.v_string, 'test') })
          eq(OK, lib.tv_dict_add(d, di))
          alloc_log:check({})
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add(d, di)
            end, 'E685: Internal error: hash_add(): duplicate key ""')
          )
          alloc_log:clear()
          lib.tv_dict_item_remove(d, di)
          alloc_log:check({
            a.freed(tv.vval.v_string),
            a.freed(di),
          })
        end)
      end)
    end)
    describe('indexing', function()
      describe('find()', function()
        local function tv_dict_find(d, key, key_len)
          local di = lib.tv_dict_find(d, key, key_len or #key)
          if di == nil then
            return nil, nil, nil
          end
          return typvalt2lua(di.di_tv), ffi.string(di.di_key), di
        end
        itp('works with NULL dict', function()
          eq(nil, lib.tv_dict_find(nil, '', 0))
          eq(nil, lib.tv_dict_find(nil, 'test', -1))
          eq(nil, lib.tv_dict_find(nil, nil, 0))
        end)
        itp('works with empty key', function()
          local lua_d = {
            [''] = 0,
            t = 1,
            te = 2,
            tes = 3,
            test = 4,
            testt = 5,
          }
          local d = dict(lua_d)
          alloc_log:clear()
          eq(lua_d, dct2tbl(d))
          alloc_log:check({})
          local dis = dict_items(d)
          eq({ 0, '', dis[''] }, { tv_dict_find(d, '', 0) })
        end)
        itp('works with len properly', function()
          local lua_d = {
            [''] = 0,
            t = 1,
            te = 2,
            tes = 3,
            test = 4,
            testt = 5,
          }
          local d = dict(lua_d)
          alloc_log:clear()
          eq(lua_d, dct2tbl(d))
          alloc_log:check({})
          for i = 0, 5 do
            local v, k = tv_dict_find(d, 'testt', i)
            eq({ i, ('testt'):sub(1, i) }, { v, k })
          end
          eq(nil, tv_dict_find(d, 'testt', 6)) -- Should take NUL byte
          eq(5, tv_dict_find(d, 'testt', -1))
          alloc_log:check({})
        end)
      end)
      describe('get_number()', function()
        itp('works with NULL dict', function()
          eq(
            0,
            check_emsg(function()
              return lib.tv_dict_get_number(nil, 'test')
            end, nil)
          )
        end)
        itp('works', function()
          local d = ffi.gc(dict({ test = {} }), nil)
          eq(
            0,
            check_emsg(function()
              return lib.tv_dict_get_number(d, 'test')
            end, 'E728: Using a Dictionary as a Number')
          )
          d = ffi.gc(dict({ tes = int(42), t = 44, te = '43' }), nil)
          alloc_log:clear()
          eq(
            0,
            check_emsg(function()
              return lib.tv_dict_get_number(d, 'test')
            end, nil)
          )
          eq(
            42,
            check_emsg(function()
              return lib.tv_dict_get_number(d, 'tes')
            end, nil)
          )
          eq(
            43,
            check_emsg(function()
              return lib.tv_dict_get_number(d, 'te')
            end, nil)
          )
          alloc_log:check({})
          eq(
            0,
            check_emsg(function()
              return lib.tv_dict_get_number(d, 't')
            end, 'E805: Using a Float as a Number')
          )
        end)
      end)
      describe('get_string()', function()
        itp('works with NULL dict', function()
          eq(
            nil,
            check_emsg(function()
              return lib.tv_dict_get_string(nil, 'test', false)
            end, nil)
          )
        end)
        itp('works', function()
          local d = ffi.gc(dict({ test = {} }), nil)
          eq(
            '',
            ffi.string(check_emsg(function()
              return lib.tv_dict_get_string(d, 'test', false)
            end, 'E731: Using a Dictionary as a String'))
          )
          d = ffi.gc(dict({ tes = int(42), t = 44, te = '43', xx = int(45) }), nil)
          alloc_log:clear()
          local dis = dict_items(d)
          eq(
            nil,
            check_emsg(function()
              return lib.tv_dict_get_string(d, 'test', false)
            end, nil)
          )
          local s42 = check_emsg(function()
            return lib.tv_dict_get_string(d, 'tes', false)
          end, nil)
          eq('42', ffi.string(s42))
          local s45 = check_emsg(function()
            return lib.tv_dict_get_string(d, 'xx', false)
          end, nil)
          eq(s42, s45)
          eq('45', ffi.string(s45))
          eq('45', ffi.string(s42))
          local s43 = check_emsg(function()
            return lib.tv_dict_get_string(d, 'te', false)
          end, nil)
          eq('43', ffi.string(s43))
          neq(s42, s43)
          eq(s43, dis.te.di_tv.vval.v_string)
          alloc_log:check({})
          local s44 = check_emsg(function()
            return lib.tv_dict_get_string(d, 't', false)
          end, nil)
          eq('44.0', ffi.string(s44))
          alloc_log:check({ a.freed(alloc_log.null), a.freed(alloc_log.null) })
        end)
        itp('allocates a string copy when requested', function()
          local function tv_dict_get_string_alloc(d, key, emsg, is_float)
            alloc_log:clear()
            local ret = check_emsg(function()
              return lib.tv_dict_get_string(d, key, true)
            end, emsg)
            local s_ret = (ret ~= nil) and ffi.string(ret) or nil
            if not emsg then
              if s_ret then
                if is_float then
                  alloc_log:check({
                    a.freed(alloc_log.null),
                    a.freed(alloc_log.null),
                    a.str(ret, s_ret),
                  })
                else
                  alloc_log:check({ a.str(ret, s_ret) })
                end
              else
                alloc_log:check({})
              end
            end
            lib.xfree(ret)
            return s_ret
          end
          local d = ffi.gc(dict({ test = {} }), nil)
          eq('', tv_dict_get_string_alloc(d, 'test', 'E731: Using a Dictionary as a String'))
          d = ffi.gc(dict({ tes = int(42), t = 44, te = '43', xx = int(45) }), nil)
          alloc_log:clear()
          eq(nil, tv_dict_get_string_alloc(d, 'test'))
          eq('42', tv_dict_get_string_alloc(d, 'tes'))
          eq('45', tv_dict_get_string_alloc(d, 'xx'))
          eq('43', tv_dict_get_string_alloc(d, 'te'))
          eq('44.0', tv_dict_get_string_alloc(d, 't', nil, true))
        end)
      end)
      describe('get_string_buf()', function()
        local function tv_dict_get_string_buf(d, key, is_float, buf, emsg)
          buf = buf or ffi.gc(lib.xmalloc(lib.NUMBUFLEN), lib.xfree)
          alloc_log:clear()
          local ret = check_emsg(function()
            return lib.tv_dict_get_string_buf(d, key, buf)
          end, emsg)
          local s_ret = (ret ~= nil) and ffi.string(ret) or nil
          if not emsg then
            if is_float then
              alloc_log:check({ a.freed(alloc_log.null), a.freed(alloc_log.null) })
            else
              alloc_log:check({})
            end
          end
          return s_ret, ret, buf
        end
        itp('works with NULL dict', function()
          eq(nil, tv_dict_get_string_buf(nil, 'test'))
        end)
        itp('works', function()
          local lua_d = {
            [''] = {},
            t = 1,
            te = int(2),
            tes = empty_list,
            test = 'tset',
            testt = 5,
          }
          local d = dict(lua_d)
          alloc_log:clear()
          eq(lua_d, dct2tbl(d))
          alloc_log:check({})
          local s, r, b
          s, r, b = tv_dict_get_string_buf(d, 'test')
          neq(r, b)
          eq('tset', s)
          s, r, b = tv_dict_get_string_buf(d, 't', true)
          eq(r, b)
          eq('1.0', s)
          s, r, b = tv_dict_get_string_buf(d, 'te')
          eq(r, b)
          eq('2', s)
        end)
      end)
      describe('get_string_buf_chk()', function()
        local function tv_dict_get_string_buf_chk(d, key, is_float, len, buf, def, emsg)
          buf = buf or ffi.gc(lib.xmalloc(lib.NUMBUFLEN), lib.xfree)
          def = def or ffi.gc(lib.xstrdup('DEFAULT'), lib.xfree)
          len = len or #key
          alloc_log:clear()
          local ret = check_emsg(function()
            return lib.tv_dict_get_string_buf_chk(d, key, len, buf, def)
          end, emsg)
          local s_ret = (ret ~= nil) and ffi.string(ret) or nil
          if not emsg then
            if is_float then
              alloc_log:check({ a.freed(alloc_log.null), a.freed(alloc_log.null) })
            else
              alloc_log:check({})
            end
          end
          return s_ret, ret, buf, def
        end
        itp('works with NULL dict', function()
          eq('DEFAULT', tv_dict_get_string_buf_chk(nil, 'test'))
        end)
        itp('works', function()
          local lua_d = {
            [''] = {},
            t = 1,
            te = int(2),
            tes = empty_list,
            test = 'tset',
            testt = 5,
          }
          local d = dict(lua_d)
          alloc_log:clear()
          eq(lua_d, dct2tbl(d))
          alloc_log:check({})
          local s, r, b, def
          s, r, b, def = tv_dict_get_string_buf_chk(d, 'test')
          neq(r, b)
          neq(r, def)
          eq('tset', s)
          s, r, b, def = tv_dict_get_string_buf_chk(d, 'test', true, 1)
          eq(r, b)
          neq(r, def)
          eq('1.0', s)
          s, r, b, def = tv_dict_get_string_buf_chk(d, 'te')
          eq(r, b)
          neq(r, def)
          eq('2', s)
          s, r, b, def = tv_dict_get_string_buf_chk(d, 'TEST')
          eq(r, def)
          neq(r, b)
          eq('DEFAULT', s)
        end)
      end)
      describe('get_callback()', function()
        local function tv_dict_get_callback(d, key, key_len, emsg)
          key_len = key_len or #key
          local cb =
            ffi.gc(ffi.cast('Callback*', lib.xmalloc(ffi.sizeof('Callback'))), lib.callback_free)
          alloc_log:clear()
          local ret = check_emsg(function()
            return lib.tv_dict_get_callback(d, key, key_len, cb)
          end, emsg)
          local cb_lua = callback2tbl(cb[0])
          return cb_lua, ret
        end
        itp('works with NULL dict', function()
          eq({ { type = 'none' }, true }, { tv_dict_get_callback(nil, '') })
        end)
        itp('works', function()
          local lua_d = {
            [''] = 'tr',
            t = int(1),
            te = { [type_key] = func_type, value = 'tr' },
            tes = { [type_key] = func_type, value = 'tr', args = { 'a', 'b' } },
            test = { [type_key] = func_type, value = 'Test', dict = { test = 1 }, args = {} },
            testt = { [type_key] = func_type, value = 'Test', dict = { test = 1 }, args = { 1 } },
          }
          local d = dict(lua_d)
          eq(lua_d, dct2tbl(d))
          eq({ { type = 'fref', fref = 'tr' }, true }, { tv_dict_get_callback(d, '', -1) })
          eq({ { type = 'none' }, true }, { tv_dict_get_callback(d, 'x', -1) })
          eq({ { type = 'fref', fref = 'tr' }, true }, { tv_dict_get_callback(d, 'testt', 0) })
          eq({ { type = 'none' }, false }, {
            tv_dict_get_callback(
              d,
              'test',
              1,
              'E6000: Argument is not a function or function name'
            ),
          })
          eq({ { type = 'fref', fref = 'tr' }, true }, { tv_dict_get_callback(d, 'testt', 2) })
          eq({
            {
              type = 'pt',
              fref = 'tr',
              pt = {
                [type_key] = func_type,
                value = 'tr',
                args = { 'a', 'b' },
              },
            },
            true,
          }, { tv_dict_get_callback(d, 'testt', 3) })
          eq({
            {
              type = 'pt',
              fref = 'Test',
              pt = { [type_key] = func_type, value = 'Test', dict = { test = 1 }, args = {} },
            },
            true,
          }, { tv_dict_get_callback(d, 'testt', 4) })
          eq({
            {
              type = 'pt',
              fref = 'Test',
              pt = { [type_key] = func_type, value = 'Test', dict = { test = 1 }, args = { 1 } },
            },
            true,
          }, { tv_dict_get_callback(d, 'testt', 5) })
        end)
      end)
    end)
    describe('add', function()
      describe('()', function()
        itp('works', function()
          local di = lib.tv_dict_item_alloc_len('t-est', 5)
          alloc_log:check({ a.di(di, 't-est') })
          di.di_tv.v_type = lib.VAR_NUMBER
          di.di_tv.vval.v_number = 42
          local d = dict({ test = 10 })
          local dis = dict_items(d)
          alloc_log:check({
            a.dict(d),
            a.di(dis.test, 'test'),
          })
          eq({ test = 10 }, dct2tbl(d))
          alloc_log:clear()
          eq(OK, lib.tv_dict_add(d, di))
          alloc_log:check({})
          eq({ test = 10, ['t-est'] = int(42) }, dct2tbl(d))
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add(d, di)
            end, 'E685: Internal error: hash_add(): duplicate key "t-est"')
          )
        end)
      end)
      describe('list()', function()
        itp('works', function()
          local l = list(1, 2, 3)
          alloc_log:clear()
          eq(1, l.lv_refcount)
          local d = dict({ test = 10 })
          alloc_log:clear()
          eq({ test = 10 }, dct2tbl(d))
          eq(OK, lib.tv_dict_add_list(d, 'testt', 3, l))
          local dis = dict_items(d)
          alloc_log:check({ a.di(dis.tes, 'tes') })
          eq({ test = 10, tes = { 1, 2, 3 } }, dct2tbl(d))
          eq(2, l.lv_refcount)
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_list(d, 'testt', 3, l)
            end, 'E685: Internal error: hash_add(): duplicate key "tes"')
          )
          eq(2, l.lv_refcount)
          alloc_log:clear()
          lib.emsg_skip = lib.emsg_skip + 1
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_list(d, 'testt', 3, l)
            end, nil)
          )
          eq(2, l.lv_refcount)
          lib.emsg_skip = lib.emsg_skip - 1
          alloc_log:clear_tmp_allocs()
          alloc_log:check({})
        end)
      end)
      describe('dict()', function()
        itp('works', function()
          local d2 = dict({ foo = 42 })
          alloc_log:clear()
          eq(1, d2.dv_refcount)
          local d = dict({ test = 10 })
          alloc_log:clear()
          eq({ test = 10 }, dct2tbl(d))
          eq(OK, lib.tv_dict_add_dict(d, 'testt', 3, d2))
          local dis = dict_items(d)
          alloc_log:check({ a.di(dis.tes, 'tes') })
          eq({ test = 10, tes = { foo = 42 } }, dct2tbl(d))
          eq(2, d2.dv_refcount)
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_dict(d, 'testt', 3, d2)
            end, 'E685: Internal error: hash_add(): duplicate key "tes"')
          )
          eq(2, d2.dv_refcount)
          alloc_log:clear()
          lib.emsg_skip = lib.emsg_skip + 1
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_dict(d, 'testt', 3, d2)
            end, nil)
          )
          eq(2, d2.dv_refcount)
          lib.emsg_skip = lib.emsg_skip - 1
          alloc_log:clear_tmp_allocs()
          alloc_log:check({})
        end)
      end)
      describe('nr()', function()
        itp('works', function()
          local d = dict({ test = 10 })
          alloc_log:clear()
          eq({ test = 10 }, dct2tbl(d))
          eq(OK, lib.tv_dict_add_nr(d, 'testt', 3, 2))
          local dis = dict_items(d)
          alloc_log:check({ a.di(dis.tes, 'tes') })
          eq({ test = 10, tes = int(2) }, dct2tbl(d))
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_nr(d, 'testt', 3, 2)
            end, 'E685: Internal error: hash_add(): duplicate key "tes"')
          )
          alloc_log:clear()
          lib.emsg_skip = lib.emsg_skip + 1
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_nr(d, 'testt', 3, 2)
            end, nil)
          )
          lib.emsg_skip = lib.emsg_skip - 1
          alloc_log:clear_tmp_allocs()
          alloc_log:check({})
        end)
      end)
      describe('float()', function()
        itp('works', function()
          local d = dict({ test = 10 })
          alloc_log:clear()
          eq({ test = 10 }, dct2tbl(d))
          eq(OK, lib.tv_dict_add_float(d, 'testt', 3, 1.5))
          local dis = dict_items(d)
          alloc_log:check({ a.di(dis.tes, 'tes') })
          eq({ test = 10, tes = 1.5 }, dct2tbl(d))
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_float(d, 'testt', 3, 1.5)
            end, 'E685: Internal error: hash_add(): duplicate key "tes"')
          )
          alloc_log:clear()
          lib.emsg_skip = lib.emsg_skip + 1
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_float(d, 'testt', 3, 1.5)
            end, nil)
          )
          lib.emsg_skip = lib.emsg_skip - 1
          alloc_log:clear_tmp_allocs()
          alloc_log:check({})
        end)
      end)
      describe('str()', function()
        itp('works', function()
          local d = dict({ test = 10 })
          alloc_log:clear()
          eq({ test = 10 }, dct2tbl(d))
          eq(OK, lib.tv_dict_add_str(d, 'testt', 3, 'TEST'))
          local dis = dict_items(d)
          alloc_log:check({
            a.str(dis.tes.di_tv.vval.v_string, 'TEST'),
            a.di(dis.tes, 'tes'),
          })
          eq({ test = 10, tes = 'TEST' }, dct2tbl(d))
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_str(d, 'testt', 3, 'TEST')
            end, 'E685: Internal error: hash_add(): duplicate key "tes"')
          )
          alloc_log:clear()
          lib.emsg_skip = lib.emsg_skip + 1
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_str(d, 'testt', 3, 'TEST')
            end, nil)
          )
          lib.emsg_skip = lib.emsg_skip - 1
          alloc_log:clear_tmp_allocs()
          alloc_log:check({})
        end)
      end)
      describe('allocated_str()', function()
        itp('works', function()
          local d = dict({ test = 10 })
          eq({ test = 10 }, dct2tbl(d))
          alloc_log:clear()
          local s1 = lib.xstrdup('TEST')
          local s2 = lib.xstrdup('TEST')
          local s3 = lib.xstrdup('TEST')
          alloc_log:check({
            a.str(s1, 'TEST'),
            a.str(s2, 'TEST'),
            a.str(s3, 'TEST'),
          })
          eq(OK, lib.tv_dict_add_allocated_str(d, 'testt', 3, s1))
          local dis = dict_items(d)
          alloc_log:check({
            a.di(dis.tes, 'tes'),
          })
          eq({ test = 10, tes = 'TEST' }, dct2tbl(d))
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_allocated_str(d, 'testt', 3, s2)
            end, 'E685: Internal error: hash_add(): duplicate key "tes"')
          )
          alloc_log:clear()
          lib.emsg_skip = lib.emsg_skip + 1
          eq(
            FAIL,
            check_emsg(function()
              return lib.tv_dict_add_allocated_str(d, 'testt', 3, s3)
            end, nil)
          )
          lib.emsg_skip = lib.emsg_skip - 1
          alloc_log:clear_tmp_allocs()
          alloc_log:check({
            a.freed(s3),
          })
        end)
      end)
    end)
    describe('clear()', function()
      itp('works', function()
        local d = dict()
        alloc_log:check({ a.dict(d) })
        eq({}, dct2tbl(d))
        lib.tv_dict_clear(d)
        eq({}, dct2tbl(d))
        lib.tv_dict_add_str(d, 'TEST', 3, 'tEsT')
        local dis = dict_items(d)
        local di = dis.TES
        local di_s = di.di_tv.vval.v_string
        alloc_log:check({ a.str(di_s), a.di(di) })
        eq({ TES = 'tEsT' }, dct2tbl(d))
        lib.tv_dict_clear(d)
        alloc_log:check({ a.freed(di_s), a.freed(di) })
        eq({}, dct2tbl(d))
      end)
    end)
    describe('extend()', function()
      local function tv_dict_extend(d1, d2, action, emsg)
        action = action or 'force'
        check_emsg(function()
          return lib.tv_dict_extend(d1, d2, action)
        end, emsg)
      end
      pending('works (skip due to flakiness)', function()
        local d1 = dict()
        alloc_log:check({ a.dict(d1) })
        eq({}, dct2tbl(d1))
        local d2 = dict()
        alloc_log:check({ a.dict(d2) })
        eq({}, dct2tbl(d2))
        tv_dict_extend(d1, d2, 'error')
        tv_dict_extend(d1, d2, 'keep')
        tv_dict_extend(d1, d2, 'force')
        alloc_log:check({})

        d1 = dict({ a = 'TEST' })
        eq({ a = 'TEST' }, dct2tbl(d1))
        local dis1 = dict_items(d1)
        local a1_s = dis1.a.di_tv.vval.v_string
        alloc_log:clear_tmp_allocs()
        alloc_log:check({
          a.dict(d1),
          a.di(dis1.a),
          a.str(a1_s),
        })
        d2 = dict({ a = 'TSET' })
        eq({ a = 'TSET' }, dct2tbl(d2))
        local dis2 = dict_items(d2)
        local a2_s = dis2.a.di_tv.vval.v_string
        alloc_log:clear_tmp_allocs()
        alloc_log:check({
          a.dict(d2),
          a.di(dis2.a),
          a.str(a2_s),
        })

        tv_dict_extend(d1, d2, 'error', 'E737: Key already exists: a')
        eq({ a = 'TEST' }, dct2tbl(d1))
        eq({ a = 'TSET' }, dct2tbl(d2))
        alloc_log:clear()

        tv_dict_extend(d1, d2, 'keep')
        alloc_log:check({})
        eq({ a = 'TEST' }, dct2tbl(d1))
        eq({ a = 'TSET' }, dct2tbl(d2))

        tv_dict_extend(d1, d2, 'force')
        alloc_log:check({
          a.freed(a1_s),
          a.str(dis1.a.di_tv.vval.v_string),
        })
        eq({ a = 'TSET' }, dct2tbl(d1))
        eq({ a = 'TSET' }, dct2tbl(d2))
      end)
      pending('disallows overriding builtin or user functions: here be the dragons', function()
        -- pending: see TODO below
        local d = dict()
        d.dv_scope = lib.VAR_DEF_SCOPE
        local f_lua = {
          [type_key] = func_type,
          value = 'tr',
        }
        local f_tv = lua2typvalt(f_lua)
        local p_lua = {
          [type_key] = func_type,
          value = 'tr',
          args = { 1 },
        }
        local p_tv = lua2typvalt(p_lua)
        eq(lib.VAR_PARTIAL, p_tv.v_type)
        local d2 = dict({ tr = f_tv })
        local d3 = dict({ tr = p_tv })
        local d4 = dict({ ['TEST:THIS'] = p_tv })
        local d5 = dict({ Test = f_tv })
        local d6 = dict({ Test = p_tv })
        eval0([[execute("function Test()\nendfunction")]])
        -- TODO: test breaks at this point
        tv_dict_extend(d, d2, 'force', 'E704: Funcref variable name must start with a capital: tr')
        tv_dict_extend(d, d3, 'force', 'E704: Funcref variable name must start with a capital: tr')
        tv_dict_extend(d, d4, 'force', 'E461: Illegal variable name: TEST:THIS')
        tv_dict_extend(d, d5, 'force', 'E705: Variable name conflicts with existing function: Test')
        tv_dict_extend(d, d6, 'force', 'E705: Variable name conflicts with existing function: Test')
        eq({}, dct2tbl(d))
        d.dv_scope = lib.VAR_SCOPE
        tv_dict_extend(d, d4, 'force', 'E461: Illegal variable name: TEST:THIS')
        eq({}, dct2tbl(d))
        tv_dict_extend(d, d2, 'force')
        eq({ tr = f_lua }, dct2tbl(d))
        tv_dict_extend(d, d3, 'force')
        eq({ tr = p_lua }, dct2tbl(d))
        tv_dict_extend(d, d5, 'force')
        eq({ tr = p_lua, Test = f_lua }, dct2tbl(d))
        tv_dict_extend(d, d6, 'force')
        eq({ tr = p_lua, Test = p_lua }, dct2tbl(d))
      end)
      itp('cares about locks and read-only items', function()
        local d_lua = { tv_locked = 1, tv_fixed = 2, di_ro = 3, di_ro_sbx = 4 }
        local d = dict(d_lua)
        local dis = dict_items(d)
        dis.tv_locked.di_tv.v_lock = lib.VAR_LOCKED
        dis.tv_fixed.di_tv.v_lock = lib.VAR_FIXED
        dis.di_ro.di_flags = bit.bor(dis.di_ro.di_flags, lib.DI_FLAGS_RO)
        dis.di_ro_sbx.di_flags = bit.bor(dis.di_ro_sbx.di_flags, lib.DI_FLAGS_RO_SBX)
        lib.sandbox = true
        local d1 = dict({ tv_locked = 41 })
        local d2 = dict({ tv_fixed = 42 })
        local d3 = dict({ di_ro = 43 })
        local d4 = dict({ di_ro_sbx = 44 })
        tv_dict_extend(d, d1, 'force', 'E741: Value is locked: extend() argument')
        tv_dict_extend(d, d2, 'force', 'E742: Cannot change value of extend() argument')
        tv_dict_extend(d, d3, 'force', 'E46: Cannot change read-only variable "extend() argument"')
        tv_dict_extend(
          d,
          d4,
          'force',
          'E794: Cannot set variable in the sandbox: "extend() argument"'
        )
        eq(d_lua, dct2tbl(d))
        lib.sandbox = false
        tv_dict_extend(d, d4, 'force')
        d_lua.di_ro_sbx = 44
        eq(d_lua, dct2tbl(d))
      end)
    end)
    describe('equal()', function()
      local function tv_dict_equal(d1, d2, ic)
        return lib.tv_dict_equal(d1, d2, ic or false)
      end
      itp('works', function()
        eq(true, tv_dict_equal(nil, nil))
        local d1 = dict()
        alloc_log:check({ a.dict(d1) })
        eq(1, d1.dv_refcount)
        eq(true, tv_dict_equal(nil, d1))
        eq(true, tv_dict_equal(d1, nil))
        eq(true, tv_dict_equal(d1, d1))
        eq(1, d1.dv_refcount)
        alloc_log:check({})
        local d_upper = dict({ a = 'TEST' })
        local dis_upper = dict_items(d_upper)
        local d_lower = dict({ a = 'test' })
        local dis_lower = dict_items(d_lower)
        local d_kupper_upper = dict({ A = 'TEST' })
        local dis_kupper_upper = dict_items(d_kupper_upper)
        local d_kupper_lower = dict({ A = 'test' })
        local dis_kupper_lower = dict_items(d_kupper_lower)
        alloc_log:clear_tmp_allocs()
        alloc_log:check({
          a.dict(d_upper),
          a.di(dis_upper.a),
          a.str(dis_upper.a.di_tv.vval.v_string),

          a.dict(d_lower),
          a.di(dis_lower.a),
          a.str(dis_lower.a.di_tv.vval.v_string),

          a.dict(d_kupper_upper),
          a.di(dis_kupper_upper.A),
          a.str(dis_kupper_upper.A.di_tv.vval.v_string),

          a.dict(d_kupper_lower),
          a.di(dis_kupper_lower.A),
          a.str(dis_kupper_lower.A.di_tv.vval.v_string),
        })
        eq(true, tv_dict_equal(d_upper, d_upper))
        eq(true, tv_dict_equal(d_upper, d_upper, true))
        eq(false, tv_dict_equal(d_upper, d_lower, false))
        eq(true, tv_dict_equal(d_upper, d_lower, true))
        eq(true, tv_dict_equal(d_kupper_upper, d_kupper_lower, true))
        eq(false, tv_dict_equal(d_kupper_upper, d_lower, true))
        eq(false, tv_dict_equal(d_kupper_upper, d_upper, true))
        alloc_log:check({})
      end)
    end)
    describe('copy()', function()
      local function tv_dict_copy(...)
        return ffi.gc(lib.tv_dict_copy(...), lib.tv_dict_unref)
      end
      itp('copies NULL correctly', function()
        eq(nil, lib.tv_dict_copy(nil, nil, true, 0))
        eq(nil, lib.tv_dict_copy(nil, nil, false, 0))
        eq(nil, lib.tv_dict_copy(nil, nil, true, 1))
        eq(nil, lib.tv_dict_copy(nil, nil, false, 1))
      end)
      itp('copies dict correctly without converting items', function()
        do
          local v = {
            a = { ['«'] = '»' },
            b = { '„' },
            ['1'] = 1,
            ['«»'] = '“',
            ns = null_string,
            nl = null_list,
            nd = null_dict,
          }
          local d_tv = lua2typvalt(v)
          local d = d_tv.vval.v_dict
          local dis = dict_items(d)
          alloc_log:clear()

          eq(1, dis.a.di_tv.vval.v_dict.dv_refcount)
          eq(1, dis.b.di_tv.vval.v_list.lv_refcount)
          local d_copy1 = tv_dict_copy(nil, d, false, 0)
          eq(2, dis.a.di_tv.vval.v_dict.dv_refcount)
          eq(2, dis.b.di_tv.vval.v_list.lv_refcount)
          local dis_copy1 = dict_items(d_copy1)
          eq(dis.a.di_tv.vval.v_dict, dis_copy1.a.di_tv.vval.v_dict)
          eq(dis.b.di_tv.vval.v_list, dis_copy1.b.di_tv.vval.v_list)
          eq(v, dct2tbl(d_copy1))
          alloc_log:clear()
          lib.tv_dict_free(ffi.gc(d_copy1, nil))
          alloc_log:clear()

          eq(1, dis.a.di_tv.vval.v_dict.dv_refcount)
          eq(1, dis.b.di_tv.vval.v_list.lv_refcount)
          local d_deepcopy1 = tv_dict_copy(nil, d, true, 0)
          neq(nil, d_deepcopy1)
          eq(1, dis.a.di_tv.vval.v_dict.dv_refcount)
          eq(1, dis.b.di_tv.vval.v_list.lv_refcount)
          local dis_deepcopy1 = dict_items(d_deepcopy1)
          neq(dis.a.di_tv.vval.v_dict, dis_deepcopy1.a.di_tv.vval.v_dict)
          neq(dis.b.di_tv.vval.v_list, dis_deepcopy1.b.di_tv.vval.v_list)
          eq(v, dct2tbl(d_deepcopy1))
          alloc_log:clear()
        end
        collectgarbage()
      end)
      itp('copies dict correctly and converts items', function()
        local vc = vimconv_alloc()
        -- UTF-8 ↔ latin1 conversions need no iconv
        eq(OK, lib.convert_setup(vc, to_cstr('utf-8'), to_cstr('latin1')))

        local v = {
          a = { ['«'] = '»' },
          b = { '„' },
          ['1'] = 1,
          ['«»'] = '“',
          ns = null_string,
          nl = null_list,
          nd = null_dict,
        }
        local d_tv = lua2typvalt(v)
        local d = d_tv.vval.v_dict
        local dis = dict_items(d)
        alloc_log:clear()

        eq(1, dis.a.di_tv.vval.v_dict.dv_refcount)
        eq(1, dis.b.di_tv.vval.v_list.lv_refcount)
        local d_deepcopy1 = tv_dict_copy(vc, d, true, 0)
        neq(nil, d_deepcopy1)
        eq(1, dis.a.di_tv.vval.v_dict.dv_refcount)
        eq(1, dis.b.di_tv.vval.v_list.lv_refcount)
        local dis_deepcopy1 = dict_items(d_deepcopy1)
        neq(dis.a.di_tv.vval.v_dict, dis_deepcopy1.a.di_tv.vval.v_dict)
        neq(dis.b.di_tv.vval.v_list, dis_deepcopy1.b.di_tv.vval.v_list)
        eq({
          a = { ['\171'] = '\187' },
          b = { '\191' },
          ['1'] = 1,
          ['\171\187'] = '\191',
          ns = null_string,
          nl = null_list,
          nd = null_dict,
        }, dct2tbl(d_deepcopy1))
        alloc_log:clear_tmp_allocs()
        alloc_log:clear()
      end)
      itp('returns different/same containers with(out) copyID', function()
        local d_inner_tv = lua2typvalt({})
        local d_tv = lua2typvalt({ a = d_inner_tv, b = d_inner_tv })
        eq(3, d_inner_tv.vval.v_dict.dv_refcount)
        local d = d_tv.vval.v_dict
        local dis = dict_items(d)
        eq(dis.a.di_tv.vval.v_dict, dis.b.di_tv.vval.v_dict)

        local d_copy1 = tv_dict_copy(nil, d, true, 0)
        local dis_copy1 = dict_items(d_copy1)
        neq(dis_copy1.a.di_tv.vval.v_dict, dis_copy1.b.di_tv.vval.v_dict)
        eq({ a = {}, b = {} }, dct2tbl(d_copy1))

        local d_copy2 = tv_dict_copy(nil, d, true, 2)
        local dis_copy2 = dict_items(d_copy2)
        eq(dis_copy2.a.di_tv.vval.v_dict, dis_copy2.b.di_tv.vval.v_dict)
        eq({ a = {}, b = {} }, dct2tbl(d_copy2))

        eq(3, d_inner_tv.vval.v_dict.dv_refcount)
      end)
      itp('works with self-referencing dict with copyID', function()
        local d_tv = lua2typvalt({})
        local d = d_tv.vval.v_dict
        eq(1, d.dv_refcount)
        lib.tv_dict_add_dict(d, 'test', 4, d)
        eq(2, d.dv_refcount)

        local d_copy1 = tv_dict_copy(nil, d, true, 2)
        eq(2, d_copy1.dv_refcount)
        local v = {}
        v.test = v
        eq(v, dct2tbl(d_copy1))

        lib.tv_dict_clear(d)
        eq(1, d.dv_refcount)

        lib.tv_dict_clear(d_copy1)
        eq(1, d_copy1.dv_refcount)
      end)
    end)
    describe('set_keys_readonly()', function()
      itp('works', function()
        local d = dict({ a = true })
        local dis = dict_items(d)
        alloc_log:check({ a.dict(d), a.di(dis.a) })
        eq(0, bit.band(dis.a.di_flags, lib.DI_FLAGS_RO))
        eq(0, bit.band(dis.a.di_flags, lib.DI_FLAGS_FIX))
        lib.tv_dict_set_keys_readonly(d)
        alloc_log:check({})
        eq(lib.DI_FLAGS_RO, bit.band(dis.a.di_flags, lib.DI_FLAGS_RO))
        eq(lib.DI_FLAGS_FIX, bit.band(dis.a.di_flags, lib.DI_FLAGS_FIX))
      end)
    end)
  end)
  describe('tv', function()
    describe('alloc', function()
      describe('list ret()', function()
        itp('works', function()
          local rettv = typvalt(lib.VAR_UNKNOWN)
          local l = lib.tv_list_alloc_ret(rettv, 0)
          eq(empty_list, typvalt2lua(rettv))
          eq(rettv.vval.v_list, l)
        end)
      end)
      describe('dict ret()', function()
        itp('works', function()
          local rettv = typvalt(lib.VAR_UNKNOWN)
          lib.tv_dict_alloc_ret(rettv)
          eq({}, typvalt2lua(rettv))
        end)
      end)
    end)
    local function defalloc()
      return {}
    end
    describe('clear()', function()
      itp('works', function()
        local function deffrees(alloc_rets)
          local ret = {}
          for i = #alloc_rets, 1, -1 do
            ret[#alloc_rets - i + 1] = alloc_rets:freed(i)
          end
          return ret
        end
        alloc_log:check({})
        lib.tv_clear(nil)
        alloc_log:check({})
        local ll = {}
        local ll_l = nil
        ll[1] = ll
        local dd = {}
        local dd_d = nil
        dd.dd = dd
        for _, v in ipairs({
          { nil_value },
          {
            null_string,
            nil,
            function()
              return { a.freed(alloc_log.null) }
            end,
          },
          { 0 },
          { int(0) },
          { true },
          { false },
          {
            'true',
            function(tv)
              return { a.str(tv.vval.v_string) }
            end,
          },
          {
            {},
            function(tv)
              return { a.dict(tv.vval.v_dict) }
            end,
          },
          {
            empty_list,
            function(tv)
              return { a.list(tv.vval.v_list) }
            end,
          },
          {
            ll,
            function(tv)
              ll_l = tv.vval.v_list
              return { a.list(tv.vval.v_list), a.li(tv.vval.v_list.lv_first) }
            end,
            defalloc,
          },
          {
            dd,
            function(tv)
              dd_d = tv.vval.v_dict
              return { a.dict(tv.vval.v_dict), a.di(first_di(tv.vval.v_dict)) }
            end,
            defalloc,
          },
        }) do
          local tv = lua2typvalt(v[1])
          local alloc_rets = {}
          alloc_log:check(get_alloc_rets((v[2] or defalloc)(tv), alloc_rets))
          lib.tv_clear(tv)
          alloc_log:check((v[3] or deffrees)(alloc_rets))
        end
        eq(1, ll_l.lv_refcount)
        eq(1, dd_d.dv_refcount)
      end)
    end)
    describe('copy()', function()
      itp('works', function()
        local function strallocs(tv)
          return { a.str(tv.vval.v_string) }
        end
        for _, v in ipairs({
          { nil_value },
          { null_string },
          { 0 },
          { int(0) },
          { true },
          { false },
          {
            {},
            function(tv)
              return { a.dict(tv.vval.v_dict) }
            end,
            nil,
            function(from, to)
              eq(2, to.vval.v_dict.dv_refcount)
              eq(to.vval.v_dict, from.vval.v_dict)
            end,
          },
          {
            empty_list,
            function(tv)
              return { a.list(tv.vval.v_list) }
            end,
            nil,
            function(from, to)
              eq(2, to.vval.v_list.lv_refcount)
              eq(to.vval.v_list, from.vval.v_list)
            end,
          },
          {
            'test',
            strallocs,
            strallocs,
            function(from, to)
              neq(to.vval.v_string, from.vval.v_string)
            end,
          },
        }) do
          local from = lua2typvalt(v[1])
          alloc_log:check((v[2] or defalloc)(from))
          local to = typvalt(lib.VAR_UNKNOWN)
          lib.tv_copy(from, to)
          local res = v[1]
          eq(res, typvalt2lua(to))
          alloc_log:check((v[3] or defalloc)(to))
          if v[4] then
            v[4](from, to)
          end
        end
      end)
    end)
    describe('item_lock()', function()
      itp('does not alter VAR_PARTIAL', function()
        local p_tv = lua2typvalt({
          [type_key] = func_type,
          value = 'tr',
          dict = {},
        })
        lib.tv_item_lock(p_tv, -1, true, false)
        eq(lib.VAR_UNLOCKED, p_tv.vval.v_partial.pt_dict.dv_lock)
      end)
      itp('does not change VAR_FIXED values', function()
        local d_tv = lua2typvalt({})
        local l_tv = lua2typvalt(empty_list)
        alloc_log:clear()
        d_tv.v_lock = lib.VAR_FIXED
        d_tv.vval.v_dict.dv_lock = lib.VAR_FIXED
        l_tv.v_lock = lib.VAR_FIXED
        l_tv.vval.v_list.lv_lock = lib.VAR_FIXED
        lib.tv_item_lock(d_tv, 1, true, false)
        lib.tv_item_lock(l_tv, 1, true, false)
        eq(lib.VAR_FIXED, d_tv.v_lock)
        eq(lib.VAR_FIXED, l_tv.v_lock)
        eq(lib.VAR_FIXED, d_tv.vval.v_dict.dv_lock)
        eq(lib.VAR_FIXED, l_tv.vval.v_list.lv_lock)
        lib.tv_item_lock(d_tv, 1, false, false)
        lib.tv_item_lock(l_tv, 1, false, false)
        eq(lib.VAR_FIXED, d_tv.v_lock)
        eq(lib.VAR_FIXED, l_tv.v_lock)
        eq(lib.VAR_FIXED, d_tv.vval.v_dict.dv_lock)
        eq(lib.VAR_FIXED, l_tv.vval.v_list.lv_lock)
        alloc_log:check({})
      end)
      itp('works with NULL values', function()
        local l_tv = lua2typvalt(null_list)
        local d_tv = lua2typvalt(null_dict)
        local s_tv = lua2typvalt(null_string)
        alloc_log:clear()
        lib.tv_item_lock(l_tv, 1, true, false)
        lib.tv_item_lock(d_tv, 1, true, false)
        lib.tv_item_lock(s_tv, 1, true, false)
        eq(null_list, typvalt2lua(l_tv))
        eq(null_dict, typvalt2lua(d_tv))
        eq(null_string, typvalt2lua(s_tv))
        eq(lib.VAR_LOCKED, d_tv.v_lock)
        eq(lib.VAR_LOCKED, l_tv.v_lock)
        eq(lib.VAR_LOCKED, s_tv.v_lock)
        alloc_log:check({})
      end)
    end)
    describe('islocked()', function()
      itp('works with NULL values', function()
        local l_tv = lua2typvalt(null_list)
        local d_tv = lua2typvalt(null_dict)
        eq(false, lib.tv_islocked(l_tv))
        eq(false, lib.tv_islocked(d_tv))
      end)
      itp('works', function()
        local tv = lua2typvalt()
        local d_tv = lua2typvalt({})
        local l_tv = lua2typvalt(empty_list)
        alloc_log:clear()
        eq(false, lib.tv_islocked(tv))
        eq(false, lib.tv_islocked(l_tv))
        eq(false, lib.tv_islocked(d_tv))
        d_tv.vval.v_dict.dv_lock = lib.VAR_LOCKED
        l_tv.vval.v_list.lv_lock = lib.VAR_LOCKED
        eq(true, lib.tv_islocked(l_tv))
        eq(true, lib.tv_islocked(d_tv))
        tv.v_lock = lib.VAR_LOCKED
        d_tv.v_lock = lib.VAR_LOCKED
        l_tv.v_lock = lib.VAR_LOCKED
        eq(true, lib.tv_islocked(tv))
        eq(true, lib.tv_islocked(l_tv))
        eq(true, lib.tv_islocked(d_tv))
        d_tv.vval.v_dict.dv_lock = lib.VAR_UNLOCKED
        l_tv.vval.v_list.lv_lock = lib.VAR_UNLOCKED
        eq(true, lib.tv_islocked(tv))
        eq(true, lib.tv_islocked(l_tv))
        eq(true, lib.tv_islocked(d_tv))
        tv.v_lock = lib.VAR_FIXED
        d_tv.v_lock = lib.VAR_FIXED
        l_tv.v_lock = lib.VAR_FIXED
        eq(false, lib.tv_islocked(tv))
        eq(false, lib.tv_islocked(l_tv))
        eq(false, lib.tv_islocked(d_tv))
        d_tv.vval.v_dict.dv_lock = lib.VAR_LOCKED
        l_tv.vval.v_list.lv_lock = lib.VAR_LOCKED
        eq(true, lib.tv_islocked(l_tv))
        eq(true, lib.tv_islocked(d_tv))
        d_tv.vval.v_dict.dv_lock = lib.VAR_FIXED
        l_tv.vval.v_list.lv_lock = lib.VAR_FIXED
        eq(false, lib.tv_islocked(l_tv))
        eq(false, lib.tv_islocked(d_tv))
        alloc_log:check({})
      end)
    end)
    describe('check_lock()', function()
      local function tv_check_lock(lock, name, name_len, emsg)
        return check_emsg(function()
          return lib.value_check_lock(lock, name, name_len)
        end, emsg)
      end
      itp('works', function()
        eq(false, tv_check_lock(lib.VAR_UNLOCKED, 'test', 3))
        eq(true, tv_check_lock(lib.VAR_LOCKED, 'test', 3, 'E741: Value is locked: tes'))
        eq(true, tv_check_lock(lib.VAR_FIXED, 'test', 3, 'E742: Cannot change value of tes'))
        eq(true, tv_check_lock(lib.VAR_LOCKED, nil, 0, 'E741: Value is locked: Unknown'))
        eq(true, tv_check_lock(lib.VAR_FIXED, nil, 0, 'E742: Cannot change value of Unknown'))
        eq(
          true,
          tv_check_lock(lib.VAR_LOCKED, nil, lib.kTVCstring, 'E741: Value is locked: Unknown')
        )
        eq(
          true,
          tv_check_lock(lib.VAR_FIXED, 'test', lib.kTVCstring, 'E742: Cannot change value of test')
        )
      end)
    end)
    describe('equal()', function()
      itp('compares empty and NULL lists correctly', function()
        local l = lua2typvalt(empty_list)
        local l2 = lua2typvalt(empty_list)
        local nl = lua2typvalt(null_list)

        -- NULL lists are equal to empty lists
        eq(true, lib.tv_equal(l, nl, true))
        eq(true, lib.tv_equal(nl, l, false))

        -- NULL lists are equal themselves
        eq(true, lib.tv_equal(nl, nl, true))
        eq(true, lib.tv_equal(nl, nl, false))

        -- As well as empty lists
        eq(true, lib.tv_equal(l, l, true))
        eq(true, lib.tv_equal(l, l2, false))
        eq(true, lib.tv_equal(l2, l, false))
        eq(true, lib.tv_equal(l2, l2, true))
      end)
      itp('compares lists correctly when case is not ignored', function()
        local l1 = lua2typvalt({ 'abc', { 1, 2, 'Abc' }, 'def' })
        local l2 = lua2typvalt({ 'abc', { 1, 2, 'Abc' } })
        local l3 = lua2typvalt({ 'abc', { 1, 2, 'Abc' }, 'Def' })
        local l4 = lua2typvalt({ 'abc', { 1, 2, 'Abc', 4 }, 'def' })
        local l5 = lua2typvalt({ 'Abc', { 1, 2, 'Abc' }, 'def' })
        local l6 = lua2typvalt({ 'abc', { 1, 2, 'Abc' }, 'def' })
        local l7 = lua2typvalt({ 'abc', { 1, 2, 'abc' }, 'def' })
        local l8 = lua2typvalt({ 'abc', nil, 'def' })
        local l9 = lua2typvalt({ 'abc', { 1, 2, nil }, 'def' })

        eq(true, lib.tv_equal(l1, l1, false))
        eq(false, lib.tv_equal(l1, l2, false))
        eq(false, lib.tv_equal(l1, l3, false))
        eq(false, lib.tv_equal(l1, l4, false))
        eq(false, lib.tv_equal(l1, l5, false))
        eq(true, lib.tv_equal(l1, l6, false))
        eq(false, lib.tv_equal(l1, l7, false))
        eq(false, lib.tv_equal(l1, l8, false))
        eq(false, lib.tv_equal(l1, l9, false))
      end)
      itp('compares lists correctly when case is ignored', function()
        local l1 = lua2typvalt({ 'abc', { 1, 2, 'Abc' }, 'def' })
        local l2 = lua2typvalt({ 'abc', { 1, 2, 'Abc' } })
        local l3 = lua2typvalt({ 'abc', { 1, 2, 'Abc' }, 'Def' })
        local l4 = lua2typvalt({ 'abc', { 1, 2, 'Abc', 4 }, 'def' })
        local l5 = lua2typvalt({ 'Abc', { 1, 2, 'Abc' }, 'def' })
        local l6 = lua2typvalt({ 'abc', { 1, 2, 'Abc' }, 'def' })
        local l7 = lua2typvalt({ 'abc', { 1, 2, 'abc' }, 'def' })
        local l8 = lua2typvalt({ 'abc', nil, 'def' })
        local l9 = lua2typvalt({ 'abc', { 1, 2, nil }, 'def' })

        eq(true, lib.tv_equal(l1, l1, true))
        eq(false, lib.tv_equal(l1, l2, true))
        eq(true, lib.tv_equal(l1, l3, true))
        eq(false, lib.tv_equal(l1, l4, true))
        eq(true, lib.tv_equal(l1, l5, true))
        eq(true, lib.tv_equal(l1, l6, true))
        eq(true, lib.tv_equal(l1, l7, true))
        eq(false, lib.tv_equal(l1, l8, true))
        eq(false, lib.tv_equal(l1, l9, true))
      end)
      local function tv_equal(d1, d2, ic)
        return lib.tv_equal(d1, d2, ic or false)
      end
      itp('works with dictionaries', function()
        local nd = lua2typvalt(null_dict)
        eq(true, tv_equal(nd, nd))
        alloc_log:check({})
        local d1 = lua2typvalt({})
        alloc_log:check({ a.dict(d1.vval.v_dict) })
        eq(1, d1.vval.v_dict.dv_refcount)
        eq(true, tv_equal(nd, d1))
        eq(true, tv_equal(d1, nd))
        eq(true, tv_equal(d1, d1))
        eq(1, d1.vval.v_dict.dv_refcount)
        alloc_log:check({})
        local d_upper = lua2typvalt({ a = 'TEST' })
        local dis_upper = dict_items(d_upper.vval.v_dict)
        local d_lower = lua2typvalt({ a = 'test' })
        local dis_lower = dict_items(d_lower.vval.v_dict)
        local d_kupper_upper = lua2typvalt({ A = 'TEST' })
        local dis_kupper_upper = dict_items(d_kupper_upper.vval.v_dict)
        local d_kupper_lower = lua2typvalt({ A = 'test' })
        local dis_kupper_lower = dict_items(d_kupper_lower.vval.v_dict)
        alloc_log:clear_tmp_allocs()
        alloc_log:check({
          a.dict(d_upper.vval.v_dict),
          a.di(dis_upper.a),
          a.str(dis_upper.a.di_tv.vval.v_string),

          a.dict(d_lower.vval.v_dict),
          a.di(dis_lower.a),
          a.str(dis_lower.a.di_tv.vval.v_string),

          a.dict(d_kupper_upper.vval.v_dict),
          a.di(dis_kupper_upper.A),
          a.str(dis_kupper_upper.A.di_tv.vval.v_string),

          a.dict(d_kupper_lower.vval.v_dict),
          a.di(dis_kupper_lower.A),
          a.str(dis_kupper_lower.A.di_tv.vval.v_string),
        })
        eq(true, tv_equal(d_upper, d_upper))
        eq(true, tv_equal(d_upper, d_upper, true))
        eq(false, tv_equal(d_upper, d_lower, false))
        eq(true, tv_equal(d_upper, d_lower, true))
        eq(true, tv_equal(d_kupper_upper, d_kupper_lower, true))
        eq(false, tv_equal(d_kupper_upper, d_lower, true))
        eq(false, tv_equal(d_kupper_upper, d_upper, true))
        alloc_log:check({})
      end)
    end)
    describe('check', function()
      describe('str_or_nr()', function()
        itp('works', function()
          local tv = typvalt()
          local mem = lib.xmalloc(1)
          tv.vval.v_list = mem -- Should crash when actually accessed
          alloc_log:clear()
          for _, v in ipairs({
            { lib.VAR_NUMBER, nil },
            { lib.VAR_FLOAT, 'E805: Expected a Number or a String, Float found' },
            { lib.VAR_PARTIAL, 'E703: Expected a Number or a String, Funcref found' },
            { lib.VAR_FUNC, 'E703: Expected a Number or a String, Funcref found' },
            { lib.VAR_LIST, 'E745: Expected a Number or a String, List found' },
            { lib.VAR_DICT, 'E728: Expected a Number or a String, Dictionary found' },
            { lib.VAR_SPECIAL, 'E5300: Expected a Number or a String' },
            { lib.VAR_UNKNOWN, 'E685: Internal error: tv_check_str_or_nr(UNKNOWN)' },
          }) do
            local typ = v[1]
            local emsg = v[2]
            local ret = true
            if emsg then
              ret = false
            end
            tv.v_type = typ
            eq(
              ret,
              check_emsg(function()
                return lib.tv_check_str_or_nr(tv)
              end, emsg)
            )
            if emsg then
              alloc_log:clear()
            else
              alloc_log:check({})
            end
          end
        end)
      end)
      describe('num()', function()
        itp('works', function()
          local tv = typvalt()
          local mem = lib.xmalloc(1)
          tv.vval.v_list = mem -- Should crash when actually accessed
          alloc_log:clear()
          for _, v in ipairs({
            { lib.VAR_NUMBER, nil },
            { lib.VAR_FLOAT, 'E805: Using a Float as a Number' },
            { lib.VAR_PARTIAL, 'E703: Using a Funcref as a Number' },
            { lib.VAR_FUNC, 'E703: Using a Funcref as a Number' },
            { lib.VAR_LIST, 'E745: Using a List as a Number' },
            { lib.VAR_DICT, 'E728: Using a Dictionary as a Number' },
            { lib.VAR_SPECIAL, nil },
            { lib.VAR_UNKNOWN, 'E685: using an invalid value as a Number' },
          }) do
            local typ = v[1]
            local emsg = v[2]
            local ret = true
            if emsg then
              ret = false
            end
            tv.v_type = typ
            eq(
              ret,
              check_emsg(function()
                return lib.tv_check_num(tv)
              end, emsg)
            )
            if emsg then
              alloc_log:clear()
            else
              alloc_log:check({})
            end
          end
        end)
      end)
      describe('str()', function()
        itp('works', function()
          local tv = typvalt()
          local mem = lib.xmalloc(1)
          tv.vval.v_list = mem -- Should crash when actually accessed
          alloc_log:clear()
          for _, v in ipairs({
            { lib.VAR_NUMBER, nil },
            { lib.VAR_FLOAT, nil },
            { lib.VAR_PARTIAL, 'E729: Using a Funcref as a String' },
            { lib.VAR_FUNC, 'E729: Using a Funcref as a String' },
            { lib.VAR_LIST, 'E730: Using a List as a String' },
            { lib.VAR_DICT, 'E731: Using a Dictionary as a String' },
            { lib.VAR_BOOL, nil },
            { lib.VAR_SPECIAL, nil },
            { lib.VAR_UNKNOWN, 'E908: Using an invalid value as a String' },
          }) do
            local typ = v[1]
            local emsg = v[2]
            local ret = true
            if emsg then
              ret = false
            end
            tv.v_type = typ
            eq(
              ret,
              check_emsg(function()
                return lib.tv_check_str(tv)
              end, emsg)
            )
            if emsg then
              alloc_log:clear()
            else
              alloc_log:check({})
            end
          end
        end)
      end)
    end)
    describe('get', function()
      describe('number()', function()
        itp('works', function()
          for _, v in ipairs({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, 42 },
            { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, 100500 },
            { lib.VAR_FLOAT, { v_float = 42.53 }, 'E805: Using a Float as a Number', 0 },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E703: Using a Funcref as a Number', 0 },
            { lib.VAR_FUNC, { v_string = NULL }, 'E703: Using a Funcref as a Number', 0 },
            { lib.VAR_LIST, { v_list = NULL }, 'E745: Using a List as a Number', 0 },
            { lib.VAR_DICT, { v_dict = NULL }, 'E728: Using a Dictionary as a Number', 0 },
            { lib.VAR_SPECIAL, { v_special = lib.kSpecialVarNull }, nil, 0 },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarTrue }, nil, 1 },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarFalse }, nil, 0 },
            { lib.VAR_UNKNOWN, nil, 'E685: Internal error: tv_get_number(UNKNOWN)', 0 },
          }) do
            -- Using to_cstr, cannot free with tv_clear
            local tv = ffi.gc(typvalt(v[1], v[2]), nil)
            alloc_log:check({})
            local emsg = v[3]
            local ret = v[4]
            eq(
              ret,
              check_emsg(function()
                return lib.tv_get_number(tv)
              end, emsg)
            )
            if emsg then
              alloc_log:clear()
            else
              alloc_log:check({})
            end
          end
        end)
      end)
      describe('number_chk()', function()
        itp('works', function()
          for _, v in ipairs({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, 42 },
            { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, 100500 },
            { lib.VAR_FLOAT, { v_float = 42.53 }, 'E805: Using a Float as a Number', 0 },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E703: Using a Funcref as a Number', 0 },
            { lib.VAR_FUNC, { v_string = NULL }, 'E703: Using a Funcref as a Number', 0 },
            { lib.VAR_LIST, { v_list = NULL }, 'E745: Using a List as a Number', 0 },
            { lib.VAR_DICT, { v_dict = NULL }, 'E728: Using a Dictionary as a Number', 0 },
            { lib.VAR_SPECIAL, { v_special = lib.kSpecialVarNull }, nil, 0 },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarTrue }, nil, 1 },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarFalse }, nil, 0 },
            { lib.VAR_UNKNOWN, nil, 'E685: Internal error: tv_get_number(UNKNOWN)', 0 },
          }) do
            -- Using to_cstr, cannot free with tv_clear
            local tv = ffi.gc(typvalt(v[1], v[2]), nil)
            alloc_log:check({})
            local emsg = v[3]
            local ret = { v[4], not not emsg }
            eq(
              ret,
              check_emsg(function()
                local err = ffi.new('bool[1]', { false })
                local res = lib.tv_get_number_chk(tv, err)
                return { res, err[0] }
              end, emsg)
            )
            if emsg then
              alloc_log:clear()
            else
              alloc_log:check({})
            end
          end
        end)
      end)
      describe('lnum()', function()
        pending('works (skip due to flakiness)', function()
          for _, v in ipairs({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, 42 },
            { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, 100500 },
            { lib.VAR_STRING, { v_string = to_cstr('.') }, nil, 46 },
            { lib.VAR_FLOAT, { v_float = 42.53 }, 'E805: Using a Float as a Number', -1 },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E703: Using a Funcref as a Number', -1 },
            { lib.VAR_FUNC, { v_string = NULL }, 'E703: Using a Funcref as a Number', -1 },
            { lib.VAR_LIST, { v_list = NULL }, 'E745: Using a List as a Number', -1 },
            { lib.VAR_DICT, { v_dict = NULL }, 'E728: Using a Dictionary as a Number', -1 },
            { lib.VAR_SPECIAL, { v_special = lib.kSpecialVarNull }, nil, 0 },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarTrue }, nil, 1 },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarFalse }, nil, 0 },
            { lib.VAR_UNKNOWN, nil, 'E685: Internal error: tv_get_number(UNKNOWN)', -1 },
          }) do
            lib.curwin.w_cursor.lnum = 46
            -- Using to_cstr, cannot free with tv_clear
            local tv = ffi.gc(typvalt(v[1], v[2]), nil)
            alloc_log:check({})
            local emsg = v[3]
            local ret = v[4]
            eq(
              ret,
              check_emsg(function()
                return lib.tv_get_lnum(tv)
              end, emsg)
            )
            if emsg then
              alloc_log:clear()
            else
              alloc_log:check({})
            end
          end
        end)
      end)
      describe('float()', function()
        itp('works', function()
          for _, v in ipairs({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, 42 },
            {
              lib.VAR_STRING,
              { v_string = to_cstr('100500') },
              'E892: Using a String as a Float',
              0,
            },
            { lib.VAR_FLOAT, { v_float = 42.53 }, nil, 42.53 },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E891: Using a Funcref as a Float', 0 },
            { lib.VAR_FUNC, { v_string = NULL }, 'E891: Using a Funcref as a Float', 0 },
            { lib.VAR_LIST, { v_list = NULL }, 'E893: Using a List as a Float', 0 },
            { lib.VAR_DICT, { v_dict = NULL }, 'E894: Using a Dictionary as a Float', 0 },
            {
              lib.VAR_SPECIAL,
              { v_special = lib.kSpecialVarNull },
              'E907: Using a special value as a Float',
              0,
            },
            {
              lib.VAR_BOOL,
              { v_bool = lib.kBoolVarTrue },
              'E362: Using a boolean value as a Float',
              0,
            },
            {
              lib.VAR_BOOL,
              { v_bool = lib.kBoolVarFalse },
              'E362: Using a boolean value as a Float',
              0,
            },
            { lib.VAR_UNKNOWN, nil, 'E685: Internal error: tv_get_float(UNKNOWN)', 0 },
          }) do
            -- Using to_cstr, cannot free with tv_clear
            local tv = ffi.gc(typvalt(v[1], v[2]), nil)
            alloc_log:check({})
            local emsg = v[3]
            local ret = v[4]
            eq(
              ret,
              check_emsg(function()
                return lib.tv_get_float(tv)
              end, emsg)
            )
            if emsg then
              alloc_log:clear()
            else
              alloc_log:check({})
            end
          end
        end)
      end)

      local function test_string_fn(input, fn)
        for _, v in ipairs(input) do
          -- Using to_cstr in place of Neovim allocated string, cannot
          -- tv_clear() that.
          local tv = ffi.gc(typvalt(v[1], v[2]), nil)
          alloc_log:check({})
          local emsg = v[3]
          local ret = v[4]
          eq(
            ret,
            check_emsg(function()
              local res, buf = fn(tv)
              if
                tv.v_type == lib.VAR_NUMBER
                or tv.v_type == lib.VAR_FLOAT
                or tv.v_type == lib.VAR_SPECIAL
                or tv.v_type == lib.VAR_BOOL
              then
                eq(buf, res)
              else
                neq(buf, res)
              end
              if res ~= nil then
                return ffi.string(res)
              else
                return nil
              end
            end, emsg)
          )
          if emsg then
            alloc_log:clear()
          elseif tv.v_type == lib.VAR_FLOAT then
            alloc_log:check({ a.freed(alloc_log.null), a.freed(alloc_log.null) })
          else
            alloc_log:check({})
          end
        end
      end
      describe('string()', function()
        pending('works (skip due to flakiness)', function()
          local buf = lib.tv_get_string(lua2typvalt(int(1)))
          local buf_chk = lib.tv_get_string_chk(lua2typvalt(int(1)))
          neq(buf, buf_chk)
          test_string_fn({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, '42' },
            { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, '100500' },
            { lib.VAR_FLOAT, { v_float = 42.53 }, nil, '42.53' },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E729: Using a Funcref as a String', '' },
            { lib.VAR_FUNC, { v_string = NULL }, 'E729: Using a Funcref as a String', '' },
            { lib.VAR_LIST, { v_list = NULL }, 'E730: Using a List as a String', '' },
            { lib.VAR_DICT, { v_dict = NULL }, 'E731: Using a Dictionary as a String', '' },
            { lib.VAR_SPECIAL, { v_special = lib.kSpecialVarNull }, nil, 'v:null' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarTrue }, nil, 'v:true' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarFalse }, nil, 'v:false' },
            { lib.VAR_UNKNOWN, nil, 'E908: Using an invalid value as a String', '' },
          }, function(tv)
            return lib.tv_get_string(tv), buf
          end)
        end)
      end)
      describe('string_chk()', function()
        itp('works', function()
          local buf = lib.tv_get_string_chk(lua2typvalt(int(1)))
          test_string_fn({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, '42' },
            { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, '100500' },
            { lib.VAR_FLOAT, { v_float = 42.53 }, nil, '42.53' },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E729: Using a Funcref as a String', nil },
            { lib.VAR_FUNC, { v_string = NULL }, 'E729: Using a Funcref as a String', nil },
            { lib.VAR_LIST, { v_list = NULL }, 'E730: Using a List as a String', nil },
            { lib.VAR_DICT, { v_dict = NULL }, 'E731: Using a Dictionary as a String', nil },
            { lib.VAR_SPECIAL, { v_special = lib.kSpecialVarNull }, nil, 'v:null' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarTrue }, nil, 'v:true' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarFalse }, nil, 'v:false' },
            { lib.VAR_UNKNOWN, nil, 'E908: Using an invalid value as a String', nil },
          }, function(tv)
            return lib.tv_get_string_chk(tv), buf
          end)
        end)
      end)
      describe('string_buf()', function()
        itp('works', function()
          test_string_fn({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, '42' },
            { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, '100500' },
            { lib.VAR_FLOAT, { v_float = 42.53 }, nil, '42.53' },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E729: Using a Funcref as a String', '' },
            { lib.VAR_FUNC, { v_string = NULL }, 'E729: Using a Funcref as a String', '' },
            { lib.VAR_LIST, { v_list = NULL }, 'E730: Using a List as a String', '' },
            { lib.VAR_DICT, { v_dict = NULL }, 'E731: Using a Dictionary as a String', '' },
            { lib.VAR_SPECIAL, { v_special = lib.kSpecialVarNull }, nil, 'v:null' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarTrue }, nil, 'v:true' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarFalse }, nil, 'v:false' },
            { lib.VAR_UNKNOWN, nil, 'E908: Using an invalid value as a String', '' },
          }, function(tv)
            local buf = ffi.new('char[?]', lib.NUMBUFLEN, { 0 })
            return lib.tv_get_string_buf(tv, buf), buf
          end)
        end)
      end)
      describe('string_buf_chk()', function()
        itp('works', function()
          test_string_fn({
            { lib.VAR_NUMBER, { v_number = 42 }, nil, '42' },
            { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, '100500' },
            { lib.VAR_FLOAT, { v_float = 42.53 }, nil, '42.53' },
            { lib.VAR_PARTIAL, { v_partial = NULL }, 'E729: Using a Funcref as a String', nil },
            { lib.VAR_FUNC, { v_string = NULL }, 'E729: Using a Funcref as a String', nil },
            { lib.VAR_LIST, { v_list = NULL }, 'E730: Using a List as a String', nil },
            { lib.VAR_DICT, { v_dict = NULL }, 'E731: Using a Dictionary as a String', nil },
            { lib.VAR_SPECIAL, { v_special = lib.kSpecialVarNull }, nil, 'v:null' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarTrue }, nil, 'v:true' },
            { lib.VAR_BOOL, { v_bool = lib.kBoolVarFalse }, nil, 'v:false' },
            { lib.VAR_UNKNOWN, nil, 'E908: Using an invalid value as a String', nil },
          }, function(tv)
            local buf = ffi.new('char[?]', lib.NUMBUFLEN, { 0 })
            return lib.tv_get_string_buf_chk(tv, buf), buf
          end)
        end)
      end)
    end)
  end)
end)
