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diff --git a/src/testdir/test_ruby.vim b/src/testdir/test_ruby.vim
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+" Tests for ruby interface
+
+source check.vim
+CheckFeature ruby
+
+func Test_ruby_change_buffer()
+  call setline(line('$'), ['1 line 1'])
+  ruby Vim.command("normal /^1\n")
+  ruby $curbuf.line = "1 changed line 1"
+  call assert_equal('1 changed line 1', getline('$'))
+endfunc
+
+func Test_rubydo()
+  " Check deleting lines does not trigger ml_get error.
+  new
+  call setline(1, ['one', 'two', 'three'])
+  rubydo Vim.command("%d_")
+  bwipe!
+
+  " Check switching to another buffer does not trigger ml_get error.
+  new
+  let wincount = winnr('$')
+  call setline(1, ['one', 'two', 'three'])
+  rubydo Vim.command("new")
+  call assert_equal(wincount + 1, winnr('$'))
+  %bwipe!
+endfunc
+
+func Test_rubydo_dollar_underscore()
+  new
+  call setline(1, ['one', 'two', 'three', 'four'])
+  2,3rubydo $_ = '[' + $_  + ']'
+  call assert_equal(['one', '[two]', '[three]', 'four'], getline(1, '$'))
+  bwipe!
+
+  call assert_fails('rubydo $_ = 0', 'E265:')
+  call assert_fails('rubydo (')
+  bwipe!
+endfunc
+
+func Test_rubyfile()
+  " Check :rubyfile does not SEGV with Ruby level exception but just fails
+  let tempfile = tempname() . '.rb'
+  call writefile(['raise "vim!"'], tempfile)
+  call assert_fails('rubyfile ' . tempfile)
+  call delete(tempfile)
+endfunc
+
+func Test_ruby_set_cursor()
+  " Check that setting the cursor position works.
+  new
+  call setline(1, ['first line', 'second line'])
+  normal gg
+  rubydo $curwin.cursor = [1, 5]
+  call assert_equal([1, 6], [line('.'), col('.')])
+  call assert_equal([1, 5], rubyeval('$curwin.cursor'))
+
+  " Check that movement after setting cursor position keeps current column.
+  normal j
+  call assert_equal([2, 6], [line('.'), col('.')])
+  call assert_equal([2, 5], '$curwin.cursor'->rubyeval())
+
+  call assert_fails('ruby $curwin.cursor = [1]',
+        \           'ArgumentError: array length must be 2')
+  bwipe!
+endfunc
+
+" Test buffer.count and buffer.length (number of lines in buffer)
+func Test_ruby_buffer_count()
+  new
+  call setline(1, ['one', 'two', 'three'])
+  call assert_equal(3, rubyeval('$curbuf.count'))
+  call assert_equal(3, rubyeval('$curbuf.length'))
+  bwipe!
+endfunc
+
+" Test buffer.name (buffer name)
+func Test_ruby_buffer_name()
+  new Xfoo
+  call assert_equal(expand('%:p'), rubyeval('$curbuf.name'))
+  bwipe
+  call assert_equal(v:null, rubyeval('$curbuf.name'))
+endfunc
+
+" Test buffer.number (number of the buffer).
+func Test_ruby_buffer_number()
+  new
+  call assert_equal(bufnr('%'), rubyeval('$curbuf.number'))
+  new
+  call assert_equal(bufnr('%'), rubyeval('$curbuf.number'))
+
+  %bwipe
+endfunc
+
+" Test buffer.delete({n}) (delete line {n})
+func Test_ruby_buffer_delete()
+  new
+  call setline(1, ['one', 'two', 'three'])
+  ruby $curbuf.delete(2)
+  call assert_equal(['one', 'three'], getline(1, '$'))
+
+  call assert_fails('ruby $curbuf.delete(0)', 'IndexError: line number 0 out of range')
+  call assert_fails('ruby $curbuf.delete(3)', 'IndexError: line number 3 out of range')
+
+  bwipe!
+endfunc
+
+" Test buffer.append({str}, str) (append line {str} after line {n})
+func Test_ruby_buffer_append()
+  new
+  ruby $curbuf.append(0, 'one')
+  ruby $curbuf.append(1, 'three')
+  ruby $curbuf.append(1, 'two')
+  ruby $curbuf.append(4, 'four')
+
+  call assert_equal(['one', 'two', 'three', '', 'four'], getline(1, '$'))
+
+  call assert_fails('ruby $curbuf.append(-1, "x")',
+        \           'IndexError: line number -1 out of range')
+  call assert_fails('ruby $curbuf.append(6, "x")',
+        \           'IndexError: line number 6 out of range')
+
+  bwipe!
+endfunc
+
+" Test buffer.line (get or set the current line)
+func Test_ruby_buffer_line()
+  new
+  call setline(1, ['one', 'two', 'three'])
+  2
+  call assert_equal('two', rubyeval('$curbuf.line'))
+
+  ruby $curbuf.line = 'TWO'
+  call assert_equal(['one', 'TWO', 'three'], getline(1, '$'))
+
+  bwipe!
+endfunc
+
+" Test buffer.line_number (get current line number)
+func Test_ruby_buffer_line_number()
+  new
+  call setline(1, ['one', 'two', 'three'])
+  2
+  call assert_equal(2, rubyeval('$curbuf.line_number'))
+
+  bwipe!
+endfunc
+
+func Test_ruby_buffer_get()
+  new
+  call setline(1, ['one', 'two'])
+  call assert_equal('one', rubyeval('$curbuf[1]'))
+  call assert_equal('two', rubyeval('$curbuf[2]'))
+
+  call assert_fails('ruby $curbuf[0]',
+        \           'IndexError: line number 0 out of range')
+  call assert_fails('ruby $curbuf[3]',
+        \           'IndexError: line number 3 out of range')
+
+  bwipe!
+endfunc
+
+func Test_ruby_buffer_set()
+  new
+  call setline(1, ['one', 'two'])
+  ruby $curbuf[2] = 'TWO'
+  ruby $curbuf[1] = 'ONE'
+
+  call assert_fails('ruby $curbuf[0] = "ZERO"',
+        \           'IndexError: line number 0 out of range')
+  call assert_fails('ruby $curbuf[3] = "THREE"',
+        \           'IndexError: line number 3 out of range')
+  bwipe!
+endfunc
+
+" Test window.width (get or set window height).
+func Test_ruby_window_height()
+  new
+
+  " Test setting window height
+  ruby $curwin.height = 2
+  call assert_equal(2, winheight(0))
+
+  " Test getting window height
+  call assert_equal(2, rubyeval('$curwin.height'))
+
+  bwipe
+endfunc
+
+" Test window.width (get or set window width).
+func Test_ruby_window_width()
+  vnew
+
+  " Test setting window width
+  ruby $curwin.width = 2
+  call assert_equal(2, winwidth(0))
+
+  " Test getting window width
+  call assert_equal(2, rubyeval('$curwin.width'))
+
+  bwipe
+endfunc
+
+" Test window.buffer (get buffer object of a window object).
+func Test_ruby_window_buffer()
+  new Xfoo1
+  new Xfoo2
+  ruby $b2 = $curwin.buffer
+  ruby $w2 = $curwin
+  wincmd j
+  ruby $b1 = $curwin.buffer
+  ruby $w1 = $curwin
+
+  call assert_equal(rubyeval('$b1'), rubyeval('$w1.buffer'))
+  call assert_equal(rubyeval('$b2'), rubyeval('$w2.buffer'))
+  call assert_equal(bufnr('Xfoo1'), rubyeval('$w1.buffer.number'))
+  call assert_equal(bufnr('Xfoo2'), rubyeval('$w2.buffer.number'))
+
+  ruby $b1, $w1, $b2, $w2 = nil
+  %bwipe
+endfunc
+
+" Test Vim::Window.current (get current window object)
+func Test_ruby_Vim_window_current()
+  let cw = rubyeval('$curwin')
+  call assert_equal(cw, rubyeval('Vim::Window.current'))
+  call assert_match('^#<Vim::Window:0x\x\+>$', cw)
+endfunc
+
+" Test Vim::Window.count (number of windows)
+func Test_ruby_Vim_window_count()
+  new Xfoo1
+  new Xfoo2
+  split
+  call assert_equal(4, rubyeval('Vim::Window.count'))
+  %bwipe
+  call assert_equal(1, rubyeval('Vim::Window.count'))
+endfunc
+
+" Test Vim::Window[n] (get window object of window n)
+func Test_ruby_Vim_window_get()
+  new Xfoo1
+  new Xfoo2
+  call assert_match('Xfoo2$', rubyeval('Vim::Window[0].buffer.name'))
+  wincmd j
+  call assert_match('Xfoo1$', rubyeval('Vim::Window[1].buffer.name'))
+  wincmd j
+  call assert_equal(v:null,   rubyeval('Vim::Window[2].buffer.name'))
+  %bwipe
+endfunc
+
+" Test Vim::Buffer.current (return the buffer object of current buffer)
+func Test_ruby_Vim_buffer_current()
+  let cb = rubyeval('$curbuf')
+  call assert_equal(cb, rubyeval('Vim::Buffer.current'))
+  call assert_match('^#<Vim::Buffer:0x\x\+>$', cb)
+endfunc
+
+" Test Vim::Buffer:.count (return the number of buffers)
+func Test_ruby_Vim_buffer_count()
+  new Xfoo1
+  new Xfoo2
+  call assert_equal(3, rubyeval('Vim::Buffer.count'))
+  %bwipe
+  call assert_equal(1, rubyeval('Vim::Buffer.count'))
+endfunc
+
+" Test Vim::buffer[n] (return the buffer object of buffer number n)
+func Test_ruby_Vim_buffer_get()
+  new Xfoo1
+  new Xfoo2
+
+  " Index of Vim::Buffer[n] goes from 0 to the number of buffers.
+  call assert_equal(v:null,   rubyeval('Vim::Buffer[0].name'))
+  call assert_match('Xfoo1$', rubyeval('Vim::Buffer[1].name'))
+  call assert_match('Xfoo2$', rubyeval('Vim::Buffer[2].name'))
+  call assert_fails('ruby print Vim::Buffer[3].name',
+        \           "NoMethodError: undefined method `name' for nil:NilClass")
+  %bwipe
+endfunc
+
+" Test Vim::command({cmd}) (execute a Ex command))
+" Test Vim::command({cmd})
+func Test_ruby_Vim_command()
+  new
+  call setline(1, ['one', 'two', 'three', 'four'])
+  ruby Vim::command('2,3d')
+  call assert_equal(['one', 'four'], getline(1, '$'))
+  bwipe!
+endfunc
+
+" Test Vim::set_option (set a vim option)
+func Test_ruby_Vim_set_option()
+  call assert_equal(0, &number)
+  ruby Vim::set_option('number')
+  call assert_equal(1, &number)
+  ruby Vim::set_option('nonumber')
+  call assert_equal(0, &number)
+endfunc
+
+func Test_ruby_Vim_evaluate()
+  call assert_equal(123,        rubyeval('Vim::evaluate("123")'))
+  " Vim::evaluate("123").class gives Integer or Fixnum depending
+  " on versions of Ruby.
+  call assert_match('^Integer\|Fixnum$', rubyeval('Vim::evaluate("123").class'))
+
+  call assert_equal(1.23,       rubyeval('Vim::evaluate("1.23")'))
+  call assert_equal('Float',    rubyeval('Vim::evaluate("1.23").class'))
+
+  call assert_equal('foo',      rubyeval('Vim::evaluate("\"foo\"")'))
+  call assert_equal('String',   rubyeval('Vim::evaluate("\"foo\"").class'))
+
+  call assert_equal(["\x01\xAB"],   rubyeval('Vim::evaluate("0z01ab").unpack("M")'))
+  call assert_equal('String',       rubyeval('Vim::evaluate("0z01ab").class'))
+
+  call assert_equal([1, 2],     rubyeval('Vim::evaluate("[1, 2]")'))
+  call assert_equal('Array',    rubyeval('Vim::evaluate("[1, 2]").class'))
+
+  call assert_equal({'1': 2},   rubyeval('Vim::evaluate("{1:2}")'))
+  call assert_equal('Hash',     rubyeval('Vim::evaluate("{1:2}").class'))
+
+  call assert_equal(v:null,     rubyeval('Vim::evaluate("v:null")'))
+  call assert_equal('NilClass', rubyeval('Vim::evaluate("v:null").class'))
+
+  call assert_equal(v:null,     rubyeval('Vim::evaluate("v:none")'))
+  call assert_equal('NilClass', rubyeval('Vim::evaluate("v:none").class'))
+
+  call assert_equal(v:true,      rubyeval('Vim::evaluate("v:true")'))
+  call assert_equal('TrueClass', rubyeval('Vim::evaluate("v:true").class'))
+  call assert_equal(v:false,     rubyeval('Vim::evaluate("v:false")'))
+  call assert_equal('FalseClass',rubyeval('Vim::evaluate("v:false").class'))
+endfunc
+
+func Test_ruby_Vim_blob()
+  call assert_equal('0z',         rubyeval('Vim::blob("")'))
+  call assert_equal('0z31326162', rubyeval('Vim::blob("12ab")'))
+  call assert_equal('0z00010203', rubyeval('Vim::blob("\x00\x01\x02\x03")'))
+  call assert_equal('0z8081FEFF', rubyeval('Vim::blob("\x80\x81\xfe\xff")'))
+endfunc
+
+func Test_ruby_Vim_evaluate_list()
+  call setline(line('$'), ['2 line 2'])
+  ruby Vim.command("normal /^2\n")
+  let l = ["abc", "def"]
+  ruby << trim EOF
+    curline = $curbuf.line_number
+    l = Vim.evaluate("l");
+    $curbuf.append(curline, l.join("\n"))
+  EOF
+  normal j
+  .rubydo $_ = $_.gsub(/\n/, '/')
+  call assert_equal('abc/def', getline('$'))
+endfunc
+
+func Test_ruby_Vim_evaluate_dict()
+  let d = {'a': 'foo', 'b': 123}
+  redir => l:out
+  ruby d = Vim.evaluate("d"); print d
+  redir END
+  call assert_equal(['{"a"=>"foo", "b"=>123}'], split(l:out, "\n"))
+endfunc
+
+" Test Vim::message({msg}) (display message {msg})
+func Test_ruby_Vim_message()
+  ruby Vim::message('A message')
+  let messages = split(execute('message'), "\n")
+  call assert_equal('A message', messages[-1])
+endfunc
+
+func Test_ruby_print()
+  func RubyPrint(expr)
+    return trim(execute('ruby print ' . a:expr))
+  endfunc
+
+  call assert_equal('123', RubyPrint('123'))
+  call assert_equal('1.23', RubyPrint('1.23'))
+  call assert_equal('Hello World!', RubyPrint('"Hello World!"'))
+  call assert_equal('[1, 2]', RubyPrint('[1, 2]'))
+  call assert_equal('{"k1"=>"v1", "k2"=>"v2"}', RubyPrint('({"k1" => "v1", "k2" => "v2"})'))
+  call assert_equal('true', RubyPrint('true'))
+  call assert_equal('false', RubyPrint('false'))
+  call assert_equal('', RubyPrint('nil'))
+  call assert_match('Vim', RubyPrint('Vim'))
+  call assert_match('Module', RubyPrint('Vim.class'))
+
+  delfunc RubyPrint
+endfunc
+
+func Test_ruby_p()
+  ruby p 'Just a test'
+  let messages = GetMessages()
+  call assert_equal('"Just a test"', messages[-1])
+
+  " Check return values of p method
+
+  call assert_equal(123, rubyeval('p(123)'))
+  call assert_equal([1, 2, 3], rubyeval('p(1, 2, 3)'))
+
+  " Avoid the "message maintainer" line.
+  let $LANG = ''
+  messages clear
+  call assert_equal(v:true, rubyeval('p() == nil'))
+
+  let messages = GetMessages()
+  call assert_equal(0, len(messages))
+endfunc
+
+func Test_rubyeval_error()
+  " On Linux or Windows the error matches:
+  "   "syntax error, unexpected end-of-input"
+  " whereas on macOS in CI, the error message makes less sense:
+  "   "SyntaxError: array length must be 2"
+  " Unclear why. The test does not check the error message.
+  call assert_fails('call rubyeval("(")')
+endfunc
+
+" Test for various heredoc syntax
+func Test_ruby_heredoc()
+  ruby << END
+Vim.command('let s = "A"')
+END
+  ruby <<
+Vim.command('let s ..= "B"')
+.
+  ruby << trim END
+    Vim.command('let s ..= "C"')
+  END
+  ruby << trim
+    Vim.command('let s ..= "D"')
+  .
+  ruby << trim eof
+    Vim.command('let s ..= "E"')
+  eof
+  call assert_equal('ABCDE', s)
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab