emacs/test/lisp/progmodes/ruby-mode-tests.el

;;; ruby-mode-tests.el --- Test suite for ruby-mode

;; Copyright (C) 2012-2017 Free Software Foundation, Inc.

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

(require 'ert)
(require 'ruby-mode)

(defmacro ruby-with-temp-buffer (contents &rest body)
  (declare (indent 1) (debug t))
  `(with-temp-buffer
     (insert ,contents)
     (ruby-mode)
     ,@body))

(defun ruby-should-indent (content column)
  "Assert indentation COLUMN on the last line of CONTENT."
  (ruby-with-temp-buffer content
    (indent-according-to-mode)
    (should (= (current-indentation) column))))

(defun ruby-should-indent-buffer (expected content)
  "Assert that CONTENT turns into EXPECTED after the buffer is re-indented.

The whitespace before and including \"|\" on each line is removed."
  (ruby-with-temp-buffer (ruby-test-string content)
    (indent-region (point-min) (point-max))
    (should (string= (ruby-test-string expected) (buffer-string)))))

(defun ruby-test-string (s &rest args)
  (apply 'format (replace-regexp-in-string "^[ \t]*|" "" s) args))

(defun ruby-assert-state (content index value &optional point)
  "Assert syntax state values at the end of CONTENT.

VALUES-PLIST is a list with alternating index and value elements."
  (ruby-with-temp-buffer content
    (when point (goto-char point))
    (syntax-propertize (point))
    (should (eq (nth index
                     (parse-partial-sexp (point-min) (point)))
                value))))

(defun ruby-assert-face (content pos face)
  (ruby-with-temp-buffer content
    (font-lock-ensure nil nil)
    (should (eq face (get-text-property pos 'face)))))

(ert-deftest ruby-indent-after-symbol-made-from-string-interpolation ()
  "It can indent the line after symbol made using string interpolation."
  (ruby-should-indent "def foo(suffix)\n  :\"bar#{suffix}\"\n"
                      ruby-indent-level))

(ert-deftest ruby-indent-after-js-style-symbol-with-block-beg-name ()
  "JS-style hash symbol can have keyword name."
  (ruby-should-indent "link_to \"home\", home_path, class: \"foo\"\n" 0))

(ert-deftest ruby-discern-singleton-class-from-heredoc ()
  (ruby-assert-state "foo <<asd\n" 3 ?\n)
  (ruby-assert-state "class <<asd\n" 3 nil))

(ert-deftest ruby-heredoc-font-lock ()
  (let ((s "foo <<eos.gsub('^ *', '')"))
    (ruby-assert-face s 9 font-lock-string-face)
    (ruby-assert-face s 10 nil)))

(ert-deftest ruby-singleton-class-no-heredoc-font-lock ()
  (ruby-assert-face "class<<a" 8 nil))

(ert-deftest ruby-heredoc-highlights-interpolations ()
  (ruby-assert-face "s = <<EOS\n  #{foo}\nEOS" 15 font-lock-variable-name-face))

(ert-deftest ruby-no-heredoc-inside-quotes ()
  (ruby-assert-state "\"<<\", \"\",\nfoo" 3 nil))

(ert-deftest ruby-no-heredoc-left-shift ()
  ;; We can't really detect the left shift operator (like in similar
  ;; cases, it depends on the type of foo), so we just require for <<
  ;; to be preceded by a character from a known set.
  (ruby-assert-state "foo(a<<b)" 3 nil))

(ert-deftest ruby-no-heredoc-class-self ()
  (ruby-assert-state "class <<self\nend" 3 nil))

(ert-deftest ruby-exit!-font-lock ()
  (ruby-assert-face "exit!" 5 font-lock-builtin-face))

(ert-deftest ruby-deep-indent ()
  (let ((ruby-deep-arglist nil)
        (ruby-deep-indent-paren '(?\( ?\{ ?\[ ?\] t)))
    (ruby-should-indent "foo = [1,\n2" 7)
    (ruby-should-indent "foo = {a: b,\nc: d" 7)
    (ruby-should-indent "foo(a,\nb" 4)))

(ert-deftest ruby-deep-indent-disabled ()
  (let ((ruby-deep-arglist nil)
        (ruby-deep-indent-paren nil))
    (ruby-should-indent "foo = [\n1" ruby-indent-level)
    (ruby-should-indent "foo = {\na: b" ruby-indent-level)
    (ruby-should-indent "foo(\na" ruby-indent-level)))

(ert-deftest ruby-indent-after-keyword-in-a-string ()
  (ruby-should-indent "a = \"abc\nif\"\n  " 0)
  (ruby-should-indent "a = %w[abc\n       def]\n  " 0)
  (ruby-should-indent "a = \"abc\n      def\"\n  " 0))

(ert-deftest ruby-regexp-doesnt-start-in-string ()
  (ruby-assert-state "'(/', /\d+/" 3 nil))

(ert-deftest ruby-regexp-starts-after-string ()
  (ruby-assert-state "'(/', /\d+/" 3 ?/ 8))

(ert-deftest ruby-regexp-interpolation-is-highlighted ()
  (ruby-assert-face "/#{foobs}/" 4 font-lock-variable-name-face))

(ert-deftest ruby-regexp-skips-over-interpolation ()
  (ruby-assert-state "/#{foobs.join('/')}/" 3 nil))

(ert-deftest ruby-regexp-continues-till-end-when-unclosed ()
  (ruby-assert-state "/bars" 3 ?/))

(ert-deftest ruby-regexp-can-be-multiline ()
  (ruby-assert-state "/bars\ntees # toots \nfoos/" 3 nil))

(ert-deftest ruby-slash-symbol-is-not-mistaken-for-regexp ()
  (ruby-assert-state ":/" 3 nil))

(ert-deftest ruby-slash-char-literal-is-not-mistaken-for-regexp ()
  (ruby-assert-state "?/" 3 nil))

(ert-deftest ruby-regexp-is-not-mistaken-for-slash-symbol ()
  (ruby-assert-state "x = /foo:/" 3 nil))

(ert-deftest ruby-indent-simple ()
  (ruby-should-indent-buffer
   "if foo
   |  bar
   |end
   |zot
   |"
   "if foo
   |bar
   |  end
   |    zot
   |"))

(ert-deftest ruby-indent-keyword-label ()
  (ruby-should-indent-buffer
   "bar(class: XXX) do
   |  foo
   |end
   |bar
   |"
   "bar(class: XXX) do
   |     foo
   |  end
   |    bar
   |"))

(ert-deftest ruby-indent-method-with-question-mark ()
  (ruby-should-indent-buffer
   "if x.is_a?(XXX)
   |  foo
   |end
   |"
   "if x.is_a?(XXX)
   | foo
   |   end
   |"))

(ert-deftest ruby-indent-expr-in-regexp ()
  (ruby-should-indent-buffer
   "if /#{foo}/ =~ s
   |  x = 1
   |end
   |"
   "if /#{foo}/ =~ s
   | x = 1
   |  end
   |"))

(ert-deftest ruby-indent-singleton-class ()
  (ruby-should-indent-buffer
   "class<<bar
   |  foo
   |end
   |"
   "class<<bar
   |foo
   |   end
   |"))

(ert-deftest ruby-indent-inside-heredoc-after-operator ()
  (ruby-should-indent-buffer
   "b=<<eos
   |     42"
   "b=<<eos
   |     42"))

(ert-deftest ruby-indent-inside-heredoc-after-space ()
  (ruby-should-indent-buffer
   "foo <<eos.gsub(' ', '*')
   |     42"
   "foo <<eos.gsub(' ', '*')
   |     42"))

(ert-deftest ruby-indent-array-literal ()
  (let ((ruby-deep-indent-paren nil))
    (ruby-should-indent-buffer
     "foo = [
     |  bar
     |]
     |"
     "foo = [
     | bar
     |  ]
     |"))
  (ruby-should-indent-buffer
   "foo do
   |  [bar]
   |end
   |"
   "foo do
   |[bar]
   |  end
   |"))

(ert-deftest ruby-indent-begin-end ()
  (ruby-should-indent-buffer
   "begin
   |  a[b]
   |end
   |"
   "begin
   | a[b]
   |  end
   |"))

(ert-deftest ruby-indent-array-after-paren-and-space ()
  (ruby-should-indent-buffer
   "class A
   |  def foo
   |    foo( [])
   |  end
   |end
   |"
   "class A
   | def foo
   |foo( [])
   |end
   |  end
   |"))

(ert-deftest ruby-indent-after-block-in-continued-expression ()
  (ruby-should-indent-buffer
   "var =
   |  begin
   |    val
   |  end
   |statement"
   "var =
   |begin
   |val
   |end
   |statement"))

(ert-deftest ruby-indent-spread-args-in-parens ()
  (let ((ruby-deep-indent-paren '(?\()))
    (ruby-should-indent-buffer
     "foo(1,
     |    2,
     |    3)
     |"
     "foo(1,
     | 2,
     |  3)
     |")))

(ert-deftest ruby-align-to-stmt-keywords-t ()
  (let ((ruby-align-to-stmt-keywords t))
    (ruby-should-indent-buffer
     "foo = if bar?
     |  1
     |else
     |  2
     |end
     |
     |foo || begin
     |  bar
     |end
     |
     |foo ||
     |  begin
     |    bar
     |  end
     |"
     "foo = if bar?
     |       1
     |else
     |  2
     | end
     |
     | foo || begin
     |    bar
     |end
     |
     |  foo ||
     | begin
     |bar
     |  end
     |")
    ))

(ert-deftest ruby-align-to-stmt-keywords-case ()
  (let ((ruby-align-to-stmt-keywords '(case)))
    (ruby-should-indent-buffer
     "b = case a
     |when 13
     |  6
     |else
     |  42
     |end"
     "b = case a
     |    when 13
     |  6
     |    else
     |      42
     |    end")))

(ert-deftest ruby-align-chained-calls ()
  (let ((ruby-align-chained-calls t))
    (ruby-should-indent-buffer
     "one.two.three
     |       .four
     |
     |my_array.select { |str| str.size > 5 }
     |        .map    { |str| str.downcase }"
     "one.two.three
     |  .four
     |
     |my_array.select { |str| str.size > 5 }
     |   .map    { |str| str.downcase }")))

(ert-deftest ruby-move-to-block-stops-at-indentation ()
  (ruby-with-temp-buffer "def f\nend"
    (beginning-of-line)
    (ruby-move-to-block -1)
    (should (looking-at "^def"))))

(ert-deftest ruby-toggle-block-to-do-end ()
  (ruby-with-temp-buffer "foo {|b|\n}"
    (beginning-of-line)
    (ruby-toggle-block)
    (should (string= "foo do |b|\nend" (buffer-string)))))

(ert-deftest ruby-toggle-block-to-brace ()
  (let ((pairs '((17 . "foo { |b| b + 2 }")
                 (16 . "foo { |b|\n  b + 2\n}"))))
    (dolist (pair pairs)
      (with-temp-buffer
        (let ((fill-column (car pair)))
          (insert "foo do |b|\n  b + 2\nend")
          (ruby-mode)
          (beginning-of-line)
          (ruby-toggle-block)
          (should (string= (cdr pair) (buffer-string))))))))

(ert-deftest ruby-toggle-block-to-multiline ()
  (ruby-with-temp-buffer "foo {|b| b + 1}"
    (beginning-of-line)
    (ruby-toggle-block)
    (should (string= "foo do |b|\n  b + 1\nend" (buffer-string)))))

(ert-deftest ruby-toggle-block-with-interpolation ()
  (ruby-with-temp-buffer "foo do\n  \"#{bar}\"\nend"
    (beginning-of-line)
    (ruby-toggle-block)
    (should (string= "foo { \"#{bar}\" }" (buffer-string)))))

(ert-deftest ruby-recognize-symbols-starting-with-at-character ()
  (ruby-assert-face ":@abc" 3 font-lock-constant-face))

(ert-deftest ruby-hash-character-not-interpolation ()
  (ruby-assert-face "\"This is #{interpolation}\"" 15
                    font-lock-variable-name-face)
  (ruby-assert-face "\"This is \\#{no interpolation} despite the #\""
                    15 font-lock-string-face)
  (ruby-assert-face "\n#@comment, not ruby code" 5 font-lock-comment-face)
  (ruby-assert-state "\n#@comment, not ruby code" 4 t)
  (ruby-assert-face "# A comment cannot have #{an interpolation} in it"
                    30 font-lock-comment-face)
  (ruby-assert-face "# #{comment}\n \"#{interpolation}\"" 16
                    font-lock-variable-name-face))

(ert-deftest ruby-interpolation-suppresses-quotes-inside ()
  (let ((s "\"<ul><li>#{@files.join(\"</li><li>\")}</li></ul>\""))
    (ruby-assert-state s 8 nil)
    (ruby-assert-face s 9 font-lock-string-face)
    (ruby-assert-face s 10 font-lock-variable-name-face)
    (ruby-assert-face s 41 font-lock-string-face)))

(ert-deftest ruby-interpolation-suppresses-one-double-quote ()
  (let ((s "\"foo#{'\"'}\""))
    (ruby-assert-state s 8 nil)
    (ruby-assert-face s 8 font-lock-variable-name-face)
    (ruby-assert-face s 11 font-lock-string-face)))

(ert-deftest ruby-interpolation-suppresses-one-backtick ()
  (let ((s "`as#{'`'}das`"))
    (ruby-assert-state s 8 nil)))

(ert-deftest ruby-interpolation-keeps-non-quote-syntax ()
  (let ((s "\"foo#{baz.tee}bar\""))
    (ruby-with-temp-buffer s
      (goto-char (point-min))
      (ruby-mode)
      (syntax-propertize (point-max))
      (search-forward "tee")
      (should (string= (thing-at-point 'symbol) "tee")))))

(ert-deftest ruby-interpolation-inside-percent-literal ()
  (let ((s "%( #{boo} )"))
    (ruby-assert-face s 1 font-lock-string-face)
    (ruby-assert-face s 4 font-lock-variable-name-face)
    (ruby-assert-face s 10 font-lock-string-face)
    (ruby-assert-state s 8 nil)))

(ert-deftest ruby-interpolation-inside-percent-literal-with-paren ()
  :expected-result :failed
  (let ((s "%(^#{\")\"}^)"))
    (ruby-assert-face s 3 font-lock-string-face)
    (ruby-assert-face s 4 font-lock-variable-name-face)
    (ruby-assert-face s 10 font-lock-string-face)
    ;; It's confused by the closing paren in the middle.
    (ruby-assert-state s 8 nil)))

(ert-deftest ruby-interpolation-inside-another-interpolation ()
  :expected-result :failed
  (let ((s "\"#{[a, b, c].map { |v| \"#{v}\" }.join}\""))
    (ruby-assert-face s 1 font-lock-string-face)
    (ruby-assert-face s 2 font-lock-variable-name-face)
    (ruby-assert-face s 38 font-lock-string-face)
    (ruby-assert-state s 8 nil)))

(ert-deftest ruby-interpolation-inside-double-quoted-percent-literals ()
  (ruby-assert-face "%Q{foo #@bar}" 8 font-lock-variable-name-face)
  (ruby-assert-face "%W{foo #@bar}" 8 font-lock-variable-name-face)
  (ruby-assert-face "%r{foo #@bar}" 8 font-lock-variable-name-face)
  (ruby-assert-face "%x{foo #@bar}" 8 font-lock-variable-name-face))

(ert-deftest ruby-no-interpolation-in-single-quoted-literals ()
  (ruby-assert-face "'foo #@bar'" 7 font-lock-string-face)
  (ruby-assert-face "%q{foo #@bar}" 8 font-lock-string-face)
  (ruby-assert-face "%w{foo #@bar}" 8 font-lock-string-face)
  (ruby-assert-face "%s{foo #@bar}" 8 font-lock-string-face))

(ert-deftest ruby-interpolation-after-dollar-sign ()
  (ruby-assert-face "\"$#{balance}\"" 2 'font-lock-string-face)
  (ruby-assert-face "\"$#{balance}\"" 3 'font-lock-variable-name-face))

(ert-deftest ruby-no-unknown-percent-literals ()
  ;; No folding of case.
  (ruby-assert-face "%S{foo}" 4 nil)
  (ruby-assert-face "%R{foo}" 4 nil))

(ert-deftest ruby-no-nested-percent-literals ()
  (ruby-with-temp-buffer "a = %w[b %()]"
    (syntax-propertize (point))
    (should (null (nth 8 (syntax-ppss))))
    (should (eq t (nth 3 (syntax-ppss (1- (point-max))))))
    (search-backward "[")
    (should (eq t (nth 3 (syntax-ppss))))))

(ert-deftest ruby-add-log-current-method-examples ()
  (let ((pairs '(("foo" . "#foo")
                 ("C.foo" . ".foo")
                 ("self.foo" . ".foo"))))
    (dolist (pair pairs)
      (let ((name  (car pair))
            (value (cdr pair)))
        (ruby-with-temp-buffer (ruby-test-string
                                "module M
                                |  class C
                                |    def %s
                                |      _
                                |    end
                                |  end
                                |end"
                                name)
          (search-backward "_")
          (forward-line)
          (should (string= (ruby-add-log-current-method)
                           (format "M::C%s" value))))))))

(ert-deftest ruby-add-log-current-method-outside-of-method ()
  (ruby-with-temp-buffer (ruby-test-string
                          "module M
                          |  class C
                          |    def foo
                          |    end
                          |    _
                          |  end
                          |end")
    (search-backward "_")
    (should (string= (ruby-add-log-current-method)"M::C"))))

(ert-deftest ruby-add-log-current-method-in-singleton-class ()
  (ruby-with-temp-buffer (ruby-test-string
                          "class C
                          |  class << self
                          |    def foo
                          |      _
                          |    end
                          |  end
                          |end")
    (search-backward "_")
    (should (string= (ruby-add-log-current-method) "C.foo"))))

(ert-deftest ruby-add-log-current-method-namespace-shorthand ()
  (ruby-with-temp-buffer (ruby-test-string
                          "class C::D
                          |  def foo
                          |    _
                          |  end
                          |end")
    (search-backward "_")
    (should (string= (ruby-add-log-current-method) "C::D#foo"))))

(ert-deftest ruby-add-log-current-method-after-inner-class ()
  (ruby-with-temp-buffer (ruby-test-string
                          "module M
                          |  class C
                          |    class D
                          |    end
                          |    def foo
                          |      _
                          |    end
                          |  end
                          |end")
    (search-backward "_")
    (should (string= (ruby-add-log-current-method) "M::C#foo"))))

(defvar ruby-block-test-example
  (ruby-test-string
   "class C
   |  def foo
   |    1
   |  end
   |
   |  def bar
   |    2
   |  end
   |
   |  def baz
   |some do
   |3
   |    end
   |  end
   |end"))

(defmacro ruby-deftest-move-to-block (name &rest body)
  (declare (indent defun))
  `(ert-deftest ,(intern (format "ruby-move-to-block-%s" name)) ()
     (with-temp-buffer
       (insert ruby-block-test-example)
       (ruby-mode)
       (goto-char (point-min))
       ,@body)))

(ruby-deftest-move-to-block works-on-do
  (forward-line 10)
  (ruby-end-of-block)
  (should (= 13 (line-number-at-pos)))
  (ruby-beginning-of-block)
  (should (= 11 (line-number-at-pos))))

(ruby-deftest-move-to-block zero-is-noop
  (forward-line 4)
  (ruby-move-to-block 0)
  (should (= 5 (line-number-at-pos))))

(ruby-deftest-move-to-block ok-with-three
  (forward-line 1)
  (ruby-move-to-block 3)
  (should (= 14 (line-number-at-pos))))

(ruby-deftest-move-to-block ok-with-minus-two
  (forward-line 9)
  (ruby-move-to-block -2)
  (should (= 2 (line-number-at-pos))))

(ert-deftest ruby-move-to-block-skips-percent-literal ()
  (dolist (s (list (ruby-test-string
                    "foo do
                    |  a = %%w(
                    |    def yaa
                    |  )
                    |end")
                   (ruby-test-string
                    "foo do
                    |  a = %%w|
                    |    end
                    |  |
                    |end")))
    (ruby-with-temp-buffer s
      (goto-char (point-min))
      (ruby-end-of-block)
      (should (= 5 (line-number-at-pos)))
      (ruby-beginning-of-block)
      (should (= 1 (line-number-at-pos))))))

(ert-deftest ruby-move-to-block-skips-heredoc ()
  (ruby-with-temp-buffer
      (ruby-test-string
       "if something_wrong?
       |  ActiveSupport::Deprecation.warn(<<-eowarn)
       |  boo hoo
       |  end
       |  eowarn
       |end")
    (goto-char (point-min))
    (ruby-end-of-block)
    (should (= 6 (line-number-at-pos)))
    (ruby-beginning-of-block)
    (should (= 1 (line-number-at-pos)))))

(ert-deftest ruby-move-to-block-does-not-fold-case ()
  (ruby-with-temp-buffer
      (ruby-test-string
       "foo do
       |  Module.to_s
       |end")
    (let ((case-fold-search t))
      (ruby-beginning-of-block))
    (should (= 1 (line-number-at-pos)))))

(ert-deftest ruby-move-to-block-moves-from-else-to-if ()
  (ruby-with-temp-buffer (ruby-test-string
                          "if true
                          |  nested_block do
                          |  end
                          |else
                          |end")
    (goto-char (point-min))
    (forward-line 3)
    (ruby-beginning-of-block)
    (should (= 1 (line-number-at-pos)))))

(ert-deftest ruby-beginning-of-defun-does-not-fold-case ()
  (ruby-with-temp-buffer
      (ruby-test-string
       "class C
       |  def bar
       |    Class.to_s
       |  end
       |end")
    (goto-char (point-min))
    (forward-line 3)
    (let ((case-fold-search t))
      (beginning-of-defun))
    (should (= 2 (line-number-at-pos)))))

(ert-deftest ruby-end-of-defun-skips-to-next-line-after-the-method ()
  (ruby-with-temp-buffer
      (ruby-test-string
       "class D
       |  def tee
       |    'ho hum'
       |  end
       |end")
    (goto-char (point-min))
    (forward-line 1)
    (end-of-defun)
    (should (= 5 (line-number-at-pos)))))

(defvar ruby-sexp-test-example
  (ruby-test-string
   "class C
   |  def foo
   |    self.end
   |    D.new.class
   |    [1, 2, 3].map do |i|
   |      i + 1
   |    end.sum
   |  end
   |end"))

(ert-deftest ruby-forward-sexp-skips-method-calls-with-keyword-names ()
  (ruby-with-temp-buffer ruby-sexp-test-example
    (goto-line 2)
    (ruby-forward-sexp)
    (should (= 8 (line-number-at-pos)))))

(ert-deftest ruby-backward-sexp-skips-method-calls-with-keyword-names ()
  (ruby-with-temp-buffer ruby-sexp-test-example
    (goto-line 8)
    (end-of-line)
    (ruby-backward-sexp)
    (should (= 2 (line-number-at-pos)))))

(ert-deftest ruby-toggle-string-quotes-quotes-correctly ()
  (let ((pairs
         '(("puts '\"foo\"\\''" . "puts \"\\\"foo\\\"'\"")
           ("puts \"'foo'\\\"\"" . "puts '\\'foo\\'\"'"))))
    (dolist (pair pairs)
      (ruby-with-temp-buffer (car pair)
        (beginning-of-line)
        (search-forward "foo")
        (ruby-toggle-string-quotes)
        (should (string= (buffer-string) (cdr pair)))))))

(ert-deftest ruby--insert-coding-comment-ruby-style ()
  (with-temp-buffer
    (let ((ruby-encoding-magic-comment-style 'ruby))
      (ruby--insert-coding-comment "utf-8")
      (should (string= "# coding: utf-8\n" (buffer-string))))))

(ert-deftest ruby--insert-coding-comment-emacs-style ()
  (with-temp-buffer
    (let ((ruby-encoding-magic-comment-style 'emacs))
      (ruby--insert-coding-comment "utf-8")
      (should (string= "# -*- coding: utf-8 -*-\n" (buffer-string))))))

(ert-deftest ruby--insert-coding-comment-custom-style ()
  (with-temp-buffer
    (let ((ruby-encoding-magic-comment-style 'custom)
          (ruby-custom-encoding-magic-comment-template "# encoding: %s\n"))
      (ruby--insert-coding-comment "utf-8")
      (should (string= "# encoding: utf-8\n\n" (buffer-string))))))


(provide 'ruby-mode-tests)

;;; ruby-mode-tests.el ends here