nvim-config/lua/core/dap_config/adapters/go.lua

local dap = require 'dap'

require('dap-go').setup({})

dap.adapters.delve = {
  type = 'server',
  port = '${port}',
  executable = {
    command = 'dlv',
    args = { 'dap', '-l', '127.0.0.1:${port}' },
  }
}

-- https://github.com/go-delve/delve/blob/master/Documentation/usage/dlv_dap.md
dap.configurations.go = {
  -- {
  --   type = "delve",
  --   name = "Debug test", -- configuration for debugging test files
  --   request = "launch",
  --   mode = "test",
  --   program = "${file}"
  -- },
  -- works with go.mod packages and sub packages
  {
    type = "delve",
    name = "Debug test (go.mod)",
    request = "launch",
    mode = "test",
    program = "./${relativeFileDirname}",
  },
  -- {
  --   type = "delve",
  --   name = "Debug",
  --   request = "launch",
  --   program = "${file}"
  -- },
}