src/testdir/test_ins_complete.vim

" Test for insert completion

source screendump.vim
source check.vim
source vim9.vim

" Test for insert expansion
func Test_ins_complete()
  edit test_ins_complete.vim
  " The files in the current directory interferes with the files
  " used by this test. So use a separate directory for the test.
  call mkdir('Xdir')
  cd Xdir

  set ff=unix
  call writefile(["test11\t36Gepeto\t/Tag/",
	      \ "asd\ttest11file\t36G",
	      \ "Makefile\tto\trun"], 'Xtestfile')
  call writefile(['', 'start of testfile',
	      \ 'ru',
	      \ 'run1',
	      \ 'run2',
	      \ 'STARTTEST',
	      \ 'ENDTEST',
	      \ 'end of testfile'], 'Xtestdata')
  set ff&

  enew!
  edit Xtestdata
  new
  call append(0, ['#include "Xtestfile"', ''])
  call cursor(2, 1)

  set cot=
  set cpt=.,w
  " add-expands (word from next line) from other window
  exe "normal iru\<C-N>\<C-N>\<C-X>\<C-N>\<Esc>\<C-A>"
  call assert_equal('run1 run3', getline('.'))
  " add-expands (current buffer first)
  exe "normal o\<C-P>\<C-X>\<C-N>"
  call assert_equal('run3 run3', getline('.'))
  " Local expansion, ends in an empty line (unless it becomes a global
  " expansion)
  exe "normal o\<C-X>\<C-P>\<C-P>\<C-P>\<C-P>\<C-P>"
  call assert_equal('', getline('.'))
  " starts Local and switches to global add-expansion
  exe "normal o\<C-X>\<C-P>\<C-P>\<C-X>\<C-X>\<C-N>\<C-X>\<C-N>\<C-N>"
  call assert_equal('run1 run2', getline('.'))

  set cpt=.,\ ,w,i
  " i-add-expands and switches to local
  exe "normal OM\<C-N>\<C-X>\<C-N>\<C-X>\<C-N>\<C-X>\<C-X>\<C-X>\<C-P>"
  call assert_equal("Makefile\tto\trun3", getline('.'))
  " add-expands lines (it would end in an empty line if it didn't ignore
  " itself)
  exe "normal o\<C-X>\<C-L>\<C-X>\<C-L>\<C-P>\<C-P>"
  call assert_equal("Makefile\tto\trun3", getline('.'))
  call assert_equal("Makefile\tto\trun3", getline(line('.') - 1))

  set cpt=kXtestfile
  " checks k-expansion, and file expansion (use Xtest11 instead of test11,
  " because TEST11.OUT may match first on DOS)
  write Xtest11.one
  write Xtest11.two
  exe "normal o\<C-N>\<Esc>IX\<Esc>A\<C-X>\<C-F>\<C-N>"
  call assert_equal('Xtest11.two', getline('.'))

  " use CTRL-X CTRL-F to complete Xtest11.one, remove it and then use CTRL-X
  " CTRL-F again to verify this doesn't cause trouble.
  exe "normal oXt\<C-X>\<C-F>\<BS>\<BS>\<BS>\<BS>\<BS>\<BS>\<BS>\<BS>\<C-X>\<C-F>"
  call assert_equal('Xtest11.one', getline('.'))
  normal ddk

  set cpt=w
  " checks make_cyclic in other window
  exe "normal oST\<C-N>\<C-P>\<C-P>\<C-P>\<C-P>"
  call assert_equal('STARTTEST', getline('.'))

  set cpt=u nohid
  " checks unloaded buffer expansion
  only
  exe "normal oEN\<C-N>"
  call assert_equal('ENDTEST', getline('.'))
  " checks adding mode abortion
  exe "normal ounl\<C-N>\<C-X>\<C-X>\<C-P>"
  call assert_equal('unless', getline('.'))

  set cpt=t,d def=^\\k* tags=Xtestfile notagbsearch
  " tag expansion, define add-expansion interrupted
  exe "normal o\<C-X>\<C-]>\<C-X>\<C-D>\<C-X>\<C-D>\<C-X>\<C-X>\<C-D>\<C-X>\<C-D>\<C-X>\<C-D>\<C-X>\<C-D>"
  call assert_equal('test11file	36Gepeto	/Tag/ asd', getline('.'))
  " t-expansion
  exe "normal oa\<C-N>\<Esc>"
  call assert_equal('asd', getline('.'))

  %bw!
  call delete('Xtestfile')
  call delete('Xtest11.one')
  call delete('Xtest11.two')
  call delete('Xtestdata')
  set cpt& cot& def& tags& tagbsearch& hidden&
  cd ..
  call delete('Xdir', 'rf')
endfunc

func Test_ins_complete_invalid_byte()
  if has('unix') && executable('base64')
    " this weird command was causing an illegal memory access
    call writefile(['bm9ybTlvMDCAMM4Dbw4OGA4ODg=='], 'Xinvalid64')
    call system('base64 -d Xinvalid64 > Xinvalid')
    call writefile(['qa!'], 'Xexit')
    call RunVim([], [], " -i NONE -n -X -Z -e -m -s -S Xinvalid -S Xexit")
    call delete('Xinvalid64')
    call delete('Xinvalid')
    call delete('Xexit')
  endif
endfunc

func Test_omni_dash()
  func Omni(findstart, base)
    if a:findstart
        return 5
    else
        echom a:base
	return ['-help', '-v']
    endif
  endfunc
  set omnifunc=Omni
  new
  exe "normal Gofind -\<C-x>\<C-o>"
  call assert_equal("find -help", getline('$'))

  bwipe!
  delfunc Omni
  set omnifunc=
endfunc

func Test_omni_autoload()
  let save_rtp = &rtp
  set rtp=Xruntime/some
  let dir = 'Xruntime/some/autoload'
  call mkdir(dir, 'p')

  let lines =<< trim END
      vim9script
      def omni#func(findstart: bool, base: string): any
          if findstart
              return 1
          else
              return ['match']
          endif
      enddef
      {
          eval 1 + 2
      }
  END
  call writefile(lines, dir .. '/omni.vim')

  new
  setlocal omnifunc=omni#func
  call feedkeys("i\<C-X>\<C-O>\<Esc>", 'xt')

  bwipe!
  call delete('Xruntime', 'rf')
  set omnifunc=
  let &rtp = save_rtp
endfunc

func Test_completefunc_args()
  let s:args = []
  func! CompleteFunc(findstart, base)
    let s:args += [[a:findstart, empty(a:base)]]
  endfunc
  new

  set completefunc=CompleteFunc
  call feedkeys("i\<C-X>\<C-U>\<Esc>", 'x')
  call assert_equal([1, 1], s:args[0])
  call assert_equal(0, s:args[1][0])
  set completefunc=

  let s:args = []
  set omnifunc=CompleteFunc
  call feedkeys("i\<C-X>\<C-O>\<Esc>", 'x')
  call assert_equal([1, 1], s:args[0])
  call assert_equal(0, s:args[1][0])
  set omnifunc=

  bwipe!
  unlet s:args
  delfunc CompleteFunc
endfunc

func s:CompleteDone_CompleteFuncNone( findstart, base )
  if a:findstart
    return 0
  endif

  return v:none
endfunc

func s:CompleteDone_CompleteFuncDict( findstart, base )
  if a:findstart
    return 0
  endif

  return {
	  \ 'words': [
	    \ {
	      \ 'word': 'aword',
	      \ 'abbr': 'wrd',
	      \ 'menu': 'extra text',
	      \ 'info': 'words are cool',
	      \ 'kind': 'W',
	      \ 'user_data': 'test'
	    \ }
	  \ ]
	\ }
endfunc

func s:CompleteDone_CheckCompletedItemNone()
  let s:called_completedone = 1
endfunc

func s:CompleteDone_CheckCompletedItemDict(pre)
  call assert_equal( 'aword',          v:completed_item[ 'word' ] )
  call assert_equal( 'wrd',            v:completed_item[ 'abbr' ] )
  call assert_equal( 'extra text',     v:completed_item[ 'menu' ] )
  call assert_equal( 'words are cool', v:completed_item[ 'info' ] )
  call assert_equal( 'W',              v:completed_item[ 'kind' ] )
  call assert_equal( 'test',           v:completed_item[ 'user_data' ] )

  if a:pre
    call assert_equal('function', complete_info().mode)
  endif

  let s:called_completedone = 1
endfunc

func Test_CompleteDoneNone()
  au CompleteDone * :call <SID>CompleteDone_CheckCompletedItemNone()
  let oldline = join(map(range(&columns), 'nr2char(screenchar(&lines-1, v:val+1))'), '')

  set completefunc=<SID>CompleteDone_CompleteFuncNone
  execute "normal a\<C-X>\<C-U>\<C-Y>"
  set completefunc&
  let newline = join(map(range(&columns), 'nr2char(screenchar(&lines-1, v:val+1))'), '')

  call assert_true(s:called_completedone)
  call assert_equal(oldline, newline)

  let s:called_completedone = 0
  au! CompleteDone
endfunc

func Test_CompleteDoneDict()
  au CompleteDonePre * :call <SID>CompleteDone_CheckCompletedItemDict(1)
  au CompleteDone * :call <SID>CompleteDone_CheckCompletedItemDict(0)

  set completefunc=<SID>CompleteDone_CompleteFuncDict
  execute "normal a\<C-X>\<C-U>\<C-Y>"
  set completefunc&

  call assert_equal('test', v:completed_item[ 'user_data' ])
  call assert_true(s:called_completedone)

  let s:called_completedone = 0
  au! CompleteDone
endfunc

func s:CompleteDone_CompleteFuncDictNoUserData(findstart, base)
  if a:findstart
    return 0
  endif

  return {
	  \ 'words': [
	    \ {
	      \ 'word': 'aword',
	      \ 'abbr': 'wrd',
	      \ 'menu': 'extra text',
	      \ 'info': 'words are cool',
	      \ 'kind': 'W',
	      \ 'user_data': ['one', 'two'],
	    \ }
	  \ ]
	\ }
endfunc

func s:CompleteDone_CheckCompletedItemDictNoUserData()
  call assert_equal( 'aword',          v:completed_item[ 'word' ] )
  call assert_equal( 'wrd',            v:completed_item[ 'abbr' ] )
  call assert_equal( 'extra text',     v:completed_item[ 'menu' ] )
  call assert_equal( 'words are cool', v:completed_item[ 'info' ] )
  call assert_equal( 'W',              v:completed_item[ 'kind' ] )
  call assert_equal( ['one', 'two'],   v:completed_item[ 'user_data' ] )

  let s:called_completedone = 1
endfunc

func Test_CompleteDoneDictNoUserData()
  au CompleteDone * :call <SID>CompleteDone_CheckCompletedItemDictNoUserData()

  set completefunc=<SID>CompleteDone_CompleteFuncDictNoUserData
  execute "normal a\<C-X>\<C-U>\<C-Y>"
  set completefunc&

  call assert_equal(['one', 'two'], v:completed_item[ 'user_data' ])
  call assert_true(s:called_completedone)

  let s:called_completedone = 0
  au! CompleteDone
endfunc

func s:CompleteDone_CompleteFuncList(findstart, base)
  if a:findstart
    return 0
  endif

  return [ 'aword' ]
endfunc

func s:CompleteDone_CheckCompletedItemList()
  call assert_equal( 'aword', v:completed_item[ 'word' ] )
  call assert_equal( '',      v:completed_item[ 'abbr' ] )
  call assert_equal( '',      v:completed_item[ 'menu' ] )
  call assert_equal( '',      v:completed_item[ 'info' ] )
  call assert_equal( '',      v:completed_item[ 'kind' ] )
  call assert_equal( '',      v:completed_item[ 'user_data' ] )

  let s:called_completedone = 1
endfunc

func Test_CompleteDoneList()
  au CompleteDone * :call <SID>CompleteDone_CheckCompletedItemList()

  set completefunc=<SID>CompleteDone_CompleteFuncList
  execute "normal a\<C-X>\<C-U>\<C-Y>"
  set completefunc&

  call assert_equal('', v:completed_item[ 'user_data' ])
  call assert_true(s:called_completedone)

  let s:called_completedone = 0
  au! CompleteDone
endfunc

func Test_CompleteDone_undo()
  au CompleteDone * call append(0, "prepend1")
  new
  call setline(1, ["line1", "line2"])
  call feedkeys("Go\<C-X>\<C-N>\<CR>\<ESC>", "tx")
  call assert_equal(["prepend1", "line1", "line2", "line1", ""],
              \     getline(1, '$'))
  undo
  call assert_equal(["line1", "line2"], getline(1, '$'))
  bwipe!
  au! CompleteDone
endfunc

func CompleteTest(findstart, query)
  if a:findstart
    return col('.')
  endif
  return ['matched']
endfunc

func Test_completefunc_info()
  new
  set completeopt=menuone
  set completefunc=CompleteTest
  call feedkeys("i\<C-X>\<C-U>\<C-R>\<C-R>=string(complete_info())\<CR>\<ESC>", "tx")
  call assert_equal("matched{'pum_visible': 1, 'mode': 'function', 'selected': 0, 'items': [{'word': 'matched', 'menu': '', 'user_data': '', 'info': '', 'kind': '', 'abbr': ''}]}", getline(1))
  bwipe!
  set completeopt&
  set completefunc&
endfunc

" Check that when using feedkeys() typeahead does not interrupt searching for
" completions.
func Test_compl_feedkeys()
  new
  set completeopt=menuone,noselect
  call feedkeys("ajump ju\<C-X>\<C-N>\<C-P>\<ESC>", "tx")
  call assert_equal("jump jump", getline(1))
  bwipe!
  set completeopt&
endfunc

func s:ComplInCmdwin_GlobalCompletion(a, l, p)
  return 'global'
endfunc

func s:ComplInCmdwin_LocalCompletion(a, l, p)
  return 'local'
endfunc

func Test_compl_in_cmdwin()
  CheckFeature cmdwin

  set wildmenu wildchar=<Tab>
  com! -nargs=1 -complete=command GetInput let input = <q-args>
  com! -buffer TestCommand echo 'TestCommand'
  let w:test_winvar = 'winvar'
  let b:test_bufvar = 'bufvar'

  " User-defined commands
  let input = ''
  call feedkeys("q:iGetInput T\<C-x>\<C-v>\<CR>", 'tx!')
  call assert_equal('TestCommand', input)

  let input = ''
  call feedkeys("q::GetInput T\<Tab>\<CR>:q\<CR>", 'tx!')
  call assert_equal('T', input)


  com! -nargs=1 -complete=var GetInput let input = <q-args>
  " Window-local variables
  let input = ''
  call feedkeys("q:iGetInput w:test_\<C-x>\<C-v>\<CR>", 'tx!')
  call assert_equal('w:test_winvar', input)

  let input = ''
  call feedkeys("q::GetInput w:test_\<Tab>\<CR>:q\<CR>", 'tx!')
  call assert_equal('w:test_', input)

  " Buffer-local variables
  let input = ''
  call feedkeys("q:iGetInput b:test_\<C-x>\<C-v>\<CR>", 'tx!')
  call assert_equal('b:test_bufvar', input)

  let input = ''
  call feedkeys("q::GetInput b:test_\<Tab>\<CR>:q\<CR>", 'tx!')
  call assert_equal('b:test_', input)


  " Argument completion of buffer-local command
  func s:ComplInCmdwin_GlobalCompletionList(a, l, p)
    return ['global']
  endfunc

  func s:ComplInCmdwin_LocalCompletionList(a, l, p)
    return ['local']
  endfunc

  func s:ComplInCmdwin_CheckCompletion(arg)
    call assert_equal('local', a:arg)
  endfunc

  com! -nargs=1 -complete=custom,<SID>ComplInCmdwin_GlobalCompletion
       \ TestCommand call s:ComplInCmdwin_CheckCompletion(<q-args>)
  com! -buffer -nargs=1 -complete=custom,<SID>ComplInCmdwin_LocalCompletion
       \ TestCommand call s:ComplInCmdwin_CheckCompletion(<q-args>)
  call feedkeys("q:iTestCommand \<Tab>\<CR>", 'tx!')

  com! -nargs=1 -complete=customlist,<SID>ComplInCmdwin_GlobalCompletionList
       \ TestCommand call s:ComplInCmdwin_CheckCompletion(<q-args>)
  com! -buffer -nargs=1 -complete=customlist,<SID>ComplInCmdwin_LocalCompletionList
       \ TestCommand call s:ComplInCmdwin_CheckCompletion(<q-args>)

  call feedkeys("q:iTestCommand \<Tab>\<CR>", 'tx!')

  func! s:ComplInCmdwin_CheckCompletion(arg)
    call assert_equal('global', a:arg)
  endfunc
  new
  call feedkeys("q:iTestCommand \<Tab>\<CR>", 'tx!')
  quit

  delfunc s:ComplInCmdwin_GlobalCompletion
  delfunc s:ComplInCmdwin_LocalCompletion
  delfunc s:ComplInCmdwin_GlobalCompletionList
  delfunc s:ComplInCmdwin_LocalCompletionList
  delfunc s:ComplInCmdwin_CheckCompletion

  delcom -buffer TestCommand
  delcom TestCommand
  delcom GetInput
  unlet w:test_winvar
  unlet b:test_bufvar
  set wildmenu& wildchar&
endfunc

" Test for insert path completion with completeslash option
func Test_ins_completeslash()
  CheckMSWindows

  call mkdir('Xdir')
  let orig_shellslash = &shellslash
  set cpt&
  new

  set noshellslash

  set completeslash=
  exe "normal oXd\<C-X>\<C-F>"
  call assert_equal('Xdir\', getline('.'))

  set completeslash=backslash
  exe "normal oXd\<C-X>\<C-F>"
  call assert_equal('Xdir\', getline('.'))

  set completeslash=slash
  exe "normal oXd\<C-X>\<C-F>"
  call assert_equal('Xdir/', getline('.'))

  set shellslash

  set completeslash=
  exe "normal oXd\<C-X>\<C-F>"
  call assert_equal('Xdir/', getline('.'))

  set completeslash=backslash
  exe "normal oXd\<C-X>\<C-F>"
  call assert_equal('Xdir\', getline('.'))

  set completeslash=slash
  exe "normal oXd\<C-X>\<C-F>"
  call assert_equal('Xdir/', getline('.'))
  %bw!
  call delete('Xdir', 'rf')

  set noshellslash
  set completeslash=slash
  call assert_true(stridx(globpath(&rtp, 'syntax/*.vim', 1, 1)[0], '\') != -1)

  let &shellslash = orig_shellslash
  set completeslash=
endfunc

func Test_pum_stopped_by_timer()
  CheckScreendump

  let lines =<< trim END
    call setline(1, ['hello', 'hullo', 'heeee', ''])
    func StartCompl()
      call timer_start(100, { -> execute('stopinsert') })
      call feedkeys("Gah\<C-N>")
    endfunc
  END

  call writefile(lines, 'Xpumscript')
  let buf = RunVimInTerminal('-S Xpumscript', #{rows: 12})
  call term_sendkeys(buf, ":call StartCompl()\<CR>")
  call TermWait(buf, 200)
  call term_sendkeys(buf, "k")
  call VerifyScreenDump(buf, 'Test_pum_stopped_by_timer', {})

  call StopVimInTerminal(buf)
  call delete('Xpumscript')
endfunc

func Test_pum_with_folds_two_tabs()
  CheckScreendump

  let lines =<< trim END
    set fdm=marker
    call setline(1, ['" x {{{1', '" a some text'])
    call setline(3, range(&lines)->map({_, val -> '" a' .. val}))
    norm! zm
    tab sp
    call feedkeys('2Gzv', 'xt')
    call feedkeys("0fa", 'xt')
  END

  call writefile(lines, 'Xpumscript')
  let buf = RunVimInTerminal('-S Xpumscript', #{rows: 10})
  call TermWait(buf, 50)
  call term_sendkeys(buf, "a\<C-N>")
  call VerifyScreenDump(buf, 'Test_pum_with_folds_two_tabs', {})

  call term_sendkeys(buf, "\<Esc>")
  call StopVimInTerminal(buf)
  call delete('Xpumscript')
endfunc

func Test_pum_with_preview_win()
  CheckScreendump

  let lines =<< trim END
      funct Omni_test(findstart, base)
	if a:findstart
	  return col(".") - 1
	endif
	return [#{word: "one", info: "1info"}, #{word: "two", info: "2info"}, #{word: "three", info: "3info"}]
      endfunc
      set omnifunc=Omni_test
      set completeopt+=longest
  END

  call writefile(lines, 'Xpreviewscript')
  let buf = RunVimInTerminal('-S Xpreviewscript', #{rows: 12})
  call TermWait(buf, 50)
  call term_sendkeys(buf, "Gi\<C-X>\<C-O>")
  call TermWait(buf, 100)
  call term_sendkeys(buf, "\<C-N>")
  call VerifyScreenDump(buf, 'Test_pum_with_preview_win', {})

  call term_sendkeys(buf, "\<Esc>")
  call StopVimInTerminal(buf)
  call delete('Xpreviewscript')
endfunc

" Test for inserting the tag search pattern in insert mode
func Test_ins_compl_tag_sft()
  call writefile([
        \ "!_TAG_FILE_ENCODING\tutf-8\t//",
        \ "first\tXfoo\t/^int first() {}$/",
        \ "second\tXfoo\t/^int second() {}$/",
        \ "third\tXfoo\t/^int third() {}$/"],
        \ 'Xtags')
  set tags=Xtags
  let code =<< trim [CODE]
    int first() {}
    int second() {}
    int third() {}
  [CODE]
  call writefile(code, 'Xfoo')

  enew
  set showfulltag
  exe "normal isec\<C-X>\<C-]>\<C-N>\<CR>"
  call assert_equal('int second() {}', getline(1))
  set noshowfulltag

  call delete('Xtags')
  call delete('Xfoo')
  set tags&
  %bwipe!
endfunc

" Test for 'completefunc' deleting text
func Test_completefunc_error()
  new
  " delete text when called for the first time
  func CompleteFunc(findstart, base)
    if a:findstart == 1
      normal dd
      return col('.') - 1
    endif
    return ['a', 'b']
  endfunc
  set completefunc=CompleteFunc
  call setline(1, ['', 'abcd', ''])
  call assert_fails('exe "normal 2G$a\<C-X>\<C-U>"', 'E578:')

  " delete text when called for the second time
  func CompleteFunc2(findstart, base)
    if a:findstart == 1
      return col('.') - 1
    endif
    normal dd
    return ['a', 'b']
  endfunc
  set completefunc=CompleteFunc2
  call setline(1, ['', 'abcd', ''])
  call assert_fails('exe "normal 2G$a\<C-X>\<C-U>"', 'E578:')

  " Jump to a different window from the complete function
  func CompleteFunc3(findstart, base)
    if a:findstart == 1
      return col('.') - 1
    endif
    wincmd p
    return ['a', 'b']
  endfunc
  set completefunc=CompleteFunc3
  new
  call assert_fails('exe "normal a\<C-X>\<C-U>"', 'E565:')
  close!

  set completefunc&
  delfunc CompleteFunc
  delfunc CompleteFunc2
  delfunc CompleteFunc3
  close!
endfunc

" Test for returning non-string values from 'completefunc'
func Test_completefunc_invalid_data()
  new
  func! CompleteFunc(findstart, base)
    if a:findstart == 1
      return col('.') - 1
    endif
    return [{}, '', 'moon']
  endfunc
  set completefunc=CompleteFunc
  exe "normal i\<C-X>\<C-U>"
  call assert_equal('moon', getline(1))
  set completefunc&
  close!
endfunc

" Test for errors in using complete() function
func Test_complete_func_error()
  call assert_fails('call complete(1, ["a"])', 'E785:')
  func ListColors()
    call complete(col('.'), "blue")
  endfunc
  call assert_fails('exe "normal i\<C-R>=ListColors()\<CR>"', 'E474:')
  func ListMonths()
    call complete(col('.'), test_null_list())
  endfunc
  call assert_fails('exe "normal i\<C-R>=ListMonths()\<CR>"', 'E474:')
  delfunc ListColors
  delfunc ListMonths
  call assert_fails('call complete_info({})', 'E714:')
  call assert_equal([], complete_info(['items']).items)
endfunc

" Test for recursively starting completion mode using complete()
func Test_recursive_complete_func()
  func ListColors()
    call complete(5, ["red", "blue"])
    return ''
  endfunc
  new
  call setline(1, ['a1', 'a2'])
  set complete=.
  exe "normal Goa\<C-X>\<C-L>\<C-R>=ListColors()\<CR>\<C-N>"
  call assert_equal('a2blue', getline(3))
  delfunc ListColors
  bw!
endfunc

" Test for completing words following a completed word in a line
func Test_complete_wrapscan()
  " complete words from another buffer
  new
  call setline(1, ['one two', 'three four'])
  new
  setlocal complete=w
  call feedkeys("itw\<C-N>\<C-X>\<C-N>\<C-X>\<C-N>\<C-X>\<C-N>", 'xt')
  call assert_equal('two three four', getline(1))
  close!
  " complete words from the current buffer
  setlocal complete=.
  %d
  call setline(1, ['one two', ''])
  call cursor(2, 1)
  call feedkeys("ion\<C-N>\<C-X>\<C-N>\<C-X>\<C-N>\<C-X>\<C-N>", 'xt')
  call assert_equal('one two one two', getline(2))
  close!
endfunc

" Test for completing special characters
func Test_complete_special_chars()
  new
  call setline(1, 'int .*[-\^$ func float')
  call feedkeys("oin\<C-X>\<C-P>\<C-X>\<C-P>\<C-X>\<C-P>", 'xt')
  call assert_equal('int .*[-\^$ func float', getline(2))
  close!
endfunc

" Test for completion when text is wrapped across lines.
func Test_complete_across_line()
  new
  call setline(1, ['red green blue', 'one two three'])
  setlocal textwidth=20
  exe "normal 2G$a re\<C-X>\<C-P>\<C-X>\<C-P>\<C-X>\<C-P>\<C-X>\<C-P>"
  call assert_equal(['one two three red', 'green blue one'], getline(2, '$'))
  close!
endfunc

" Test for completing words with a '.' at the end of a word.
func Test_complete_joinspaces()
  new
  call setline(1, ['one two.', 'three. four'])
  set joinspaces
  exe "normal Goon\<C-P>\<C-X>\<C-P>\<C-X>\<C-P>\<C-X>\<C-P>\<C-X>\<C-P>"
  call assert_equal("one two.  three. four", getline(3))
  set joinspaces&
  bw!
endfunc

" Test for using CTRL-L to add one character when completing matching
func Test_complete_add_onechar()
  new
  call setline(1, ['wool', 'woodwork'])
  call feedkeys("Gowoo\<C-P>\<C-P>\<C-P>\<C-L>f", 'xt')
  call assert_equal('woof', getline(3))

  " use 'ignorecase' and backspace to erase characters from the prefix string
  " and then add letters using CTRL-L
  %d
  set ignorecase backspace=2
  setlocal complete=.
  call setline(1, ['workhorse', 'workload'])
  normal Go
  exe "normal aWOR\<C-P>\<bs>\<bs>\<bs>\<bs>\<bs>\<bs>\<C-L>r\<C-L>\<C-L>"
  call assert_equal('workh', getline(3))
  set ignorecase& backspace&
  close!
endfunc

" Test for using CTRL-X CTRL-L to complete whole lines lines
func Test_complete_wholeline()
  new
  " complete one-line
  call setline(1, ['a1', 'a2'])
  exe "normal ggoa\<C-X>\<C-L>"
  call assert_equal(['a1', 'a1', 'a2'], getline(1, '$'))
  " go to the next match (wrapping around the buffer)
  exe "normal 2GCa\<C-X>\<C-L>\<C-N>"
  call assert_equal(['a1', 'a', 'a2'], getline(1, '$'))
  " go to the next match
  exe "normal 2GCa\<C-X>\<C-L>\<C-N>\<C-N>"
  call assert_equal(['a1', 'a2', 'a2'], getline(1, '$'))
  exe "normal 2GCa\<C-X>\<C-L>\<C-N>\<C-N>\<C-N>"
  call assert_equal(['a1', 'a1', 'a2'], getline(1, '$'))
  " repeat the test using CTRL-L
  " go to the next match (wrapping around the buffer)
  exe "normal 2GCa\<C-X>\<C-L>\<C-L>"
  call assert_equal(['a1', 'a2', 'a2'], getline(1, '$'))
  " go to the next match
  exe "normal 2GCa\<C-X>\<C-L>\<C-L>\<C-L>"
  call assert_equal(['a1', 'a', 'a2'], getline(1, '$'))
  exe "normal 2GCa\<C-X>\<C-L>\<C-L>\<C-L>\<C-L>"
  call assert_equal(['a1', 'a1', 'a2'], getline(1, '$'))
  %d
  " use CTRL-X CTRL-L to add one more line
  call setline(1, ['a1', 'b1'])
  setlocal complete=.
  exe "normal ggOa\<C-X>\<C-L>\<C-X>\<C-L>\<C-X>\<C-L>"
  call assert_equal(['a1', 'b1', '', 'a1', 'b1'], getline(1, '$'))
  bw!
endfunc

" Test insert completion with 'cindent' (adjust the indent)
func Test_complete_with_cindent()
  new
  setlocal cindent
  call setline(1, ['if (i == 1)', "    j = 2;"])
  exe "normal Go{\<CR>i\<C-X>\<C-L>\<C-X>\<C-L>\<CR>}"
  call assert_equal(['{', "\tif (i == 1)", "\t\tj = 2;", '}'], getline(3, '$'))

  %d
  call setline(1, ['when while', '{', ''])
  setlocal cinkeys+==while
  exe "normal Giwh\<C-P> "
  call assert_equal("\twhile ", getline('$'))
  close!
endfunc

" Test for <CTRL-X> <CTRL-V> completion. Complete commands and functions
func Test_complete_cmdline()
  new
  exe "normal icaddb\<C-X>\<C-V>"
  call assert_equal('caddbuffer', getline(1))
  exe "normal ocall getqf\<C-X>\<C-V>"
  call assert_equal('call getqflist(', getline(2))
  exe "normal oabcxyz(\<C-X>\<C-V>"
  call assert_equal('abcxyz(', getline(3))
  com! -buffer TestCommand1 echo 'TestCommand1'
  com! -buffer TestCommand2 echo 'TestCommand2'
  write TestCommand1Test
  write TestCommand2Test
  " Test repeating <CTRL-X> <CTRL-V> and switching to another CTRL-X mode
  exe "normal oT\<C-X>\<C-V>\<C-X>\<C-V>\<C-X>\<C-F>\<Esc>"
  call assert_equal('TestCommand2Test', getline(4))
  call delete('TestCommand1Test')
  call delete('TestCommand2Test')
  delcom TestCommand1
  delcom TestCommand2
  close!
endfunc

" Test for <CTRL-X> <CTRL-Z> stopping completion without changing the match
func Test_complete_stop()
  new
  func Save_mode1()
    let g:mode1 = mode(1)
    return ''
  endfunc
  func Save_mode2()
    let g:mode2 = mode(1)
    return ''
  endfunc
  inoremap <F1> <C-R>=Save_mode1()<CR>
  inoremap <F2> <C-R>=Save_mode2()<CR>
  call setline(1, ['aaa bbb ccc '])
  exe "normal A\<C-N>\<C-P>\<F1>\<C-X>\<C-Z>\<F2>\<Esc>"
  call assert_equal('ic', g:mode1)
  call assert_equal('i', g:mode2)
  call assert_equal('aaa bbb ccc ', getline(1))
  exe "normal A\<C-N>\<Down>\<F1>\<C-X>\<C-Z>\<F2>\<Esc>"
  call assert_equal('ic', g:mode1)
  call assert_equal('i', g:mode2)
  call assert_equal('aaa bbb ccc aaa', getline(1))
  set completeopt+=noselect
  exe "normal A \<C-N>\<Down>\<Down>\<C-L>\<C-L>\<F1>\<C-X>\<C-Z>\<F2>\<Esc>"
  call assert_equal('ic', g:mode1)
  call assert_equal('i', g:mode2)
  call assert_equal('aaa bbb ccc aaa bb', getline(1))
  set completeopt&
  exe "normal A d\<C-N>\<F1>\<C-X>\<C-Z>\<F2>\<Esc>"
  call assert_equal('ic', g:mode1)
  call assert_equal('i', g:mode2)
  call assert_equal('aaa bbb ccc aaa bb d', getline(1))
  com! -buffer TestCommand1 echo 'TestCommand1'
  com! -buffer TestCommand2 echo 'TestCommand2'
  exe "normal oT\<C-X>\<C-V>\<C-X>\<C-V>\<F1>\<C-X>\<C-Z>\<F2>\<Esc>"
  call assert_equal('ic', g:mode1)
  call assert_equal('i', g:mode2)
  call assert_equal('TestCommand2', getline(2))
  delcom TestCommand1
  delcom TestCommand2
  unlet g:mode1
  unlet g:mode2
  iunmap <F1>
  iunmap <F2>
  delfunc Save_mode1
  delfunc Save_mode2
  close!
endfunc

" Test for typing CTRL-R in insert completion mode to insert a register
" content.
func Test_complete_reginsert()
  new
  call setline(1, ['a1', 'a12', 'a123', 'a1234'])

  " if a valid CTRL-X mode key is returned from <C-R>=, then it should be
  " processed. Otherwise, CTRL-X mode should be stopped and the key should be
  " inserted.
  exe "normal Goa\<C-P>\<C-R>=\"\\<C-P>\"\<CR>"
  call assert_equal('a123', getline(5))
  let @r = "\<C-P>\<C-P>"
  exe "normal GCa\<C-P>\<C-R>r"
  call assert_equal('a12', getline(5))
  exe "normal GCa\<C-P>\<C-R>=\"x\"\<CR>"
  call assert_equal('a1234x', getline(5))
  bw!
endfunc

func Test_issue_7021()
  CheckMSWindows

  let orig_shellslash = &shellslash
  set noshellslash

  set completeslash=slash
  call assert_false(expand('~') =~ '/')

  let &shellslash = orig_shellslash
  set completeslash=
endfunc

" Test for 'longest' setting in 'completeopt' with latin1 and utf-8 encodings
func Test_complete_longest_match()
  for e in ['latin1', 'utf-8']
    exe 'set encoding=' .. e
    new
    set complete=.
    set completeopt=menu,longest
    call setline(1, ['pfx_a1', 'pfx_a12', 'pfx_a123', 'pfx_b1'])
    exe "normal Gopfx\<C-P>"
    call assert_equal('pfx_', getline(5))
    bw!
  endfor

  " Test for completing additional words with longest match set
  new
  call setline(1, ['abc1', 'abd2'])
  exe "normal Goab\<C-P>\<C-X>\<C-P>"
  call assert_equal('ab', getline(3))
  bw!
  set complete& completeopt&
endfunc

" Test for removing the first displayed completion match and selecting the
" match just before that.
func Test_complete_erase_firstmatch()
  new
  call setline(1, ['a12', 'a34', 'a56'])
  set complete=.
  exe "normal Goa\<C-P>\<BS>\<BS>3\<CR>"
  call assert_equal('a34', getline('$'))
  set complete&
  bw!
endfunc

" Test for completing whole lines from unloaded buffers
func Test_complete_wholeline_unloadedbuf()
  call writefile(['a line1', 'a line2', 'a line3'], "Xfile1")
  edit Xfile1
  enew
  set complete=u
  exe "normal! ia\<C-X>\<C-L>\<C-P>"
  call assert_equal('a line2', getline(1))
  %d
  " completing from an unlisted buffer should fail
  bdel Xfile1
  exe "normal! ia\<C-X>\<C-L>\<C-P>"
  call assert_equal('a', getline(1))
  set complete&
  %bw!
  call delete("Xfile1")
endfunc

" Test for completing whole lines from unlisted buffers
func Test_complete_wholeline_unlistedbuf()
  call writefile(['a line1', 'a line2', 'a line3'], "Xfile1")
  edit Xfile1
  enew
  set complete=U
  " completing from a unloaded buffer should fail
  exe "normal! ia\<C-X>\<C-L>\<C-P>"
  call assert_equal('a', getline(1))
  %d
  bdel Xfile1
  exe "normal! ia\<C-X>\<C-L>\<C-P>"
  call assert_equal('a line2', getline(1))
  set complete&
  %bw!
  call delete("Xfile1")
endfunc

" Test for adding a multibyte character using CTRL-L in completion mode
func Test_complete_mbyte_char_add()
  new
  set complete=.
  call setline(1, 'abė')
  exe "normal! oa\<C-P>\<BS>\<BS>\<C-L>\<C-L>"
  call assert_equal('abė', getline(2))
  " Test for a leader with multibyte character
  %d
  call setline(1, 'abėĕ')
  exe "normal! oabė\<C-P>"
  call assert_equal('abėĕ', getline(2))
  bw!
endfunc

" Test to ensure 'Scanning...' messages are not recorded in messages history
func Test_z1_complete_no_history()
  new
  messages clear
  let currmess = execute('messages')
  setlocal dictionary=README.txt
  exe "normal owh\<C-X>\<C-K>"
  exe "normal owh\<C-N>"
  call assert_equal(currmess, execute('messages'))
  close!
endfunc

" Test for different ways of setting the 'completefunc' option
func Test_completefunc_callback()
  func CompleteFunc1(callnr, findstart, base)
    call add(g:CompleteFunc1Args, [a:callnr, a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc
  func CompleteFunc2(findstart, base)
    call add(g:CompleteFunc2Args, [a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc

  let lines =<< trim END
    #" Test for using a global function name
    LET &completefunc = 'g:CompleteFunc2'
    new
    call setline(1, 'global')
    LET g:CompleteFunc2Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[1, ''], [0, 'global']], g:CompleteFunc2Args)
    bw!

    #" Test for using a function()
    set completefunc=function('g:CompleteFunc1',\ [10])
    new
    call setline(1, 'one')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[10, 1, ''], [10, 0, 'one']], g:CompleteFunc1Args)
    bw!

    #" Using a funcref variable to set 'completefunc'
    VAR Fn = function('g:CompleteFunc1', [11])
    LET &completefunc = Fn
    new
    call setline(1, 'two')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[11, 1, ''], [11, 0, 'two']], g:CompleteFunc1Args)
    bw!

    #" Using string(funcref_variable) to set 'completefunc'
    LET Fn = function('g:CompleteFunc1', [12])
    LET &completefunc = string(Fn)
    new
    call setline(1, 'two')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[12, 1, ''], [12, 0, 'two']], g:CompleteFunc1Args)
    bw!

    #" Test for using a funcref()
    set completefunc=funcref('g:CompleteFunc1',\ [13])
    new
    call setline(1, 'three')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[13, 1, ''], [13, 0, 'three']], g:CompleteFunc1Args)
    bw!

    #" Using a funcref variable to set 'completefunc'
    LET Fn = funcref('g:CompleteFunc1', [14])
    LET &completefunc = Fn
    new
    call setline(1, 'four')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[14, 1, ''], [14, 0, 'four']], g:CompleteFunc1Args)
    bw!

    #" Using a string(funcref_variable) to set 'completefunc'
    LET Fn = funcref('g:CompleteFunc1', [15])
    LET &completefunc = string(Fn)
    new
    call setline(1, 'four')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[15, 1, ''], [15, 0, 'four']], g:CompleteFunc1Args)
    bw!

    #" Test for using a lambda function with set
    VAR optval = "LSTART a, b LMIDDLE CompleteFunc1(16, a, b) LEND"
    LET optval = substitute(optval, ' ', '\\ ', 'g')
    exe "set completefunc=" .. optval
    new
    call setline(1, 'five')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[16, 1, ''], [16, 0, 'five']], g:CompleteFunc1Args)
    bw!

    #" Set 'completefunc' to a lambda expression
    LET &completefunc = LSTART a, b LMIDDLE CompleteFunc1(17, a, b) LEND
    new
    call setline(1, 'six')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[17, 1, ''], [17, 0, 'six']], g:CompleteFunc1Args)
    bw!

    #" Set 'completefunc' to string(lambda_expression)
    LET &completefunc = 'LSTART a, b LMIDDLE CompleteFunc1(18, a, b) LEND'
    new
    call setline(1, 'six')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[18, 1, ''], [18, 0, 'six']], g:CompleteFunc1Args)
    bw!

    #" Set 'completefunc' to a variable with a lambda expression
    VAR Lambda = LSTART a, b LMIDDLE CompleteFunc1(19, a, b) LEND
    LET &completefunc = Lambda
    new
    call setline(1, 'seven')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[19, 1, ''], [19, 0, 'seven']], g:CompleteFunc1Args)
    bw!

    #" Set 'completefunc' to a string(variable with a lambda expression)
    LET Lambda = LSTART a, b LMIDDLE CompleteFunc1(20, a, b) LEND
    LET &completefunc = string(Lambda)
    new
    call setline(1, 'seven')
    LET g:CompleteFunc1Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[20, 1, ''], [20, 0, 'seven']], g:CompleteFunc1Args)
    bw!

    #" Test for using a lambda function with incorrect return value
    LET Lambda = LSTART a, b LMIDDLE strlen(a) LEND
    LET &completefunc = Lambda
    new
    call setline(1, 'eight')
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    bw!

    #" Test for clearing the 'completefunc' option
    set completefunc=''
    set completefunc&
    call assert_fails("set completefunc=function('abc')", "E700:")
    call assert_fails("set completefunc=funcref('abc')", "E700:")

    #" set 'completefunc' to a non-existing function
    set completefunc=CompleteFunc2
    call setline(1, 'five')
    call assert_fails("set completefunc=function('NonExistingFunc')", 'E700:')
    call assert_fails("LET &completefunc = function('NonExistingFunc')", 'E700:')
    LET g:CompleteFunc2Args = []
    call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    call assert_equal([[1, ''], [0, 'five']], g:CompleteFunc2Args)
    bw!
  END
  call CheckLegacyAndVim9Success(lines)

  " Test for using a script-local function name
  func s:CompleteFunc3(findstart, base)
    call add(g:CompleteFunc3Args, [a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc
  set completefunc=s:CompleteFunc3
  new
  call setline(1, 'script1')
  let g:CompleteFunc3Args = []
  call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
  call assert_equal([[1, ''], [0, 'script1']], g:CompleteFunc3Args)
  bw!

  let &completefunc = 's:CompleteFunc3'
  new
  call setline(1, 'script2')
  let g:CompleteFunc3Args = []
  call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
  call assert_equal([[1, ''], [0, 'script2']], g:CompleteFunc3Args)
  bw!
  delfunc s:CompleteFunc3

  " invalid return value
  let &completefunc = {a -> 'abc'}
  call feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')

  " Using Vim9 lambda expression in legacy context should fail
  set completefunc=(a,\ b)\ =>\ CompleteFunc1(21,\ a,\ b)
  new | only
  let g:CompleteFunc1Args = []
  call assert_fails('call feedkeys("A\<C-X>\<C-U>\<Esc>", "x")', 'E117:')
  call assert_equal([], g:CompleteFunc1Args)

  " set 'completefunc' to a partial with dict. This used to cause a crash.
  func SetCompleteFunc()
    let params = {'complete': function('g:DictCompleteFunc')}
    let &completefunc = params.complete
  endfunc
  func g:DictCompleteFunc(_) dict
  endfunc
  call SetCompleteFunc()
  new
  call SetCompleteFunc()
  bw
  call test_garbagecollect_now()
  new
  set completefunc=
  wincmd w
  set completefunc=
  %bw!
  delfunc g:DictCompleteFunc
  delfunc SetCompleteFunc

  " Vim9 tests
  let lines =<< trim END
    vim9script

    def Vim9CompleteFunc(callnr: number, findstart: number, base: string): any
      add(g:Vim9completeFuncArgs, [callnr, findstart, base])
      return findstart ? 0 : []
    enddef

    # Test for using a def function with completefunc
    set completefunc=function('Vim9CompleteFunc',\ [60])
    new | only
    setline(1, 'one')
    g:Vim9completeFuncArgs = []
    feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    assert_equal([[60, 1, ''], [60, 0, 'one']], g:Vim9completeFuncArgs)
    bw!

    # Test for using a global function name
    &completefunc = g:CompleteFunc2
    new | only
    setline(1, 'two')
    g:CompleteFunc2Args = []
    feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    assert_equal([[1, ''], [0, 'two']], g:CompleteFunc2Args)
    bw!

    # Test for using a script-local function name
    def s:LocalCompleteFunc(findstart: number, base: string): any
      add(g:LocalCompleteFuncArgs, [findstart, base])
      return findstart ? 0 : []
    enddef
    &completefunc = s:LocalCompleteFunc
    new | only
    setline(1, 'three')
    g:LocalCompleteFuncArgs = []
    feedkeys("A\<C-X>\<C-U>\<Esc>", 'x')
    assert_equal([[1, ''], [0, 'three']], g:LocalCompleteFuncArgs)
    bw!
  END
  call CheckScriptSuccess(lines)

  " cleanup
  set completefunc&
  delfunc CompleteFunc1
  delfunc CompleteFunc2
  unlet g:CompleteFunc1Args g:CompleteFunc2Args
  %bw!
endfunc

" Test for different ways of setting the 'omnifunc' option
func Test_omnifunc_callback()
  func OmniFunc1(callnr, findstart, base)
    call add(g:OmniFunc1Args, [a:callnr, a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc
  func OmniFunc2(findstart, base)
    call add(g:OmniFunc2Args, [a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc

  let lines =<< trim END
    #" Test for using a function name
    LET &omnifunc = 'g:OmniFunc2'
    new
    call setline(1, 'zero')
    LET g:OmniFunc2Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[1, ''], [0, 'zero']], g:OmniFunc2Args)
    bw!

    #" Test for using a function()
    set omnifunc=function('g:OmniFunc1',\ [10])
    new
    call setline(1, 'one')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[10, 1, ''], [10, 0, 'one']], g:OmniFunc1Args)
    bw!

    #" Using a funcref variable to set 'omnifunc'
    VAR Fn = function('g:OmniFunc1', [11])
    LET &omnifunc = Fn
    new
    call setline(1, 'two')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[11, 1, ''], [11, 0, 'two']], g:OmniFunc1Args)
    bw!

    #" Using a string(funcref_variable) to set 'omnifunc'
    LET Fn = function('g:OmniFunc1', [12])
    LET &omnifunc = string(Fn)
    new
    call setline(1, 'two')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[12, 1, ''], [12, 0, 'two']], g:OmniFunc1Args)
    bw!

    #" Test for using a funcref()
    set omnifunc=funcref('g:OmniFunc1',\ [13])
    new
    call setline(1, 'three')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[13, 1, ''], [13, 0, 'three']], g:OmniFunc1Args)
    bw!

    #" Use let to set 'omnifunc' to a funcref
    LET Fn = funcref('g:OmniFunc1', [14])
    LET &omnifunc = Fn
    new
    call setline(1, 'four')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[14, 1, ''], [14, 0, 'four']], g:OmniFunc1Args)
    bw!

    #" Using a string(funcref) to set 'omnifunc'
    LET Fn = funcref("g:OmniFunc1", [15])
    LET &omnifunc = string(Fn)
    new
    call setline(1, 'four')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[15, 1, ''], [15, 0, 'four']], g:OmniFunc1Args)
    bw!

    #" Test for using a lambda function with set
    VAR optval = "LSTART a, b LMIDDLE OmniFunc1(16, a, b) LEND"
    LET optval = substitute(optval, ' ', '\\ ', 'g')
    exe "set omnifunc=" .. optval
    new
    call setline(1, 'five')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[16, 1, ''], [16, 0, 'five']], g:OmniFunc1Args)
    bw!

    #" Set 'omnifunc' to a lambda expression
    LET &omnifunc = LSTART a, b LMIDDLE OmniFunc1(17, a, b) LEND
    new
    call setline(1, 'six')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[17, 1, ''], [17, 0, 'six']], g:OmniFunc1Args)
    bw!

    #" Set 'omnifunc' to a string(lambda_expression)
    LET &omnifunc = 'LSTART a, b LMIDDLE OmniFunc1(18, a, b) LEND'
    new
    call setline(1, 'six')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[18, 1, ''], [18, 0, 'six']], g:OmniFunc1Args)
    bw!

    #" Set 'omnifunc' to a variable with a lambda expression
    VAR Lambda = LSTART a, b LMIDDLE OmniFunc1(19, a, b) LEND
    LET &omnifunc = Lambda
    new
    call setline(1, 'seven')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[19, 1, ''], [19, 0, 'seven']], g:OmniFunc1Args)
    bw!

    #" Set 'omnifunc' to a string(variable with a lambda expression)
    LET Lambda = LSTART a, b LMIDDLE OmniFunc1(20, a, b) LEND
    LET &omnifunc = string(Lambda)
    new
    call setline(1, 'seven')
    LET g:OmniFunc1Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[20, 1, ''], [20, 0, 'seven']], g:OmniFunc1Args)
    bw!

    #" Test for using a lambda function with incorrect return value
    LET Lambda = LSTART a, b LMIDDLE strlen(a) LEND
    LET &omnifunc = Lambda
    new
    call setline(1, 'eight')
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    bw!

    #" Test for clearing the 'omnifunc' option
    set omnifunc=''
    set omnifunc&
    call assert_fails("set omnifunc=function('abc')", "E700:")
    call assert_fails("set omnifunc=funcref('abc')", "E700:")

    #" set 'omnifunc' to a non-existing function
    set omnifunc=OmniFunc2
    call setline(1, 'nine')
    call assert_fails("set omnifunc=function('NonExistingFunc')", 'E700:')
    call assert_fails("LET &omnifunc = function('NonExistingFunc')", 'E700:')
    LET g:OmniFunc2Args = []
    call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    call assert_equal([[1, ''], [0, 'nine']], g:OmniFunc2Args)
    bw!
  END
  call CheckLegacyAndVim9Success(lines)

  " Test for using a script-local function name
  func s:OmniFunc3(findstart, base)
    call add(g:OmniFunc3Args, [a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc
  set omnifunc=s:OmniFunc3
  new
  call setline(1, 'script1')
  let g:OmniFunc3Args = []
  call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
  call assert_equal([[1, ''], [0, 'script1']], g:OmniFunc3Args)
  bw!

  let &omnifunc = 's:OmniFunc3'
  new
  call setline(1, 'script2')
  let g:OmniFunc3Args = []
  call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
  call assert_equal([[1, ''], [0, 'script2']], g:OmniFunc3Args)
  bw!
  delfunc s:OmniFunc3

  " invalid return value
  let &omnifunc = {a -> 'abc'}
  call feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')

  " Using Vim9 lambda expression in legacy context should fail
  set omnifunc=(a,\ b)\ =>\ OmniFunc1(21,\ a,\ b)
  new | only
  let g:OmniFunc1Args = []
  call assert_fails('call feedkeys("A\<C-X>\<C-O>\<Esc>", "x")', 'E117:')
  call assert_equal([], g:OmniFunc1Args)

  " set 'omnifunc' to a partial with dict. This used to cause a crash.
  func SetOmniFunc()
    let params = {'omni': function('g:DictOmniFunc')}
    let &omnifunc = params.omni
  endfunc
  func g:DictOmniFunc(_) dict
  endfunc
  call SetOmniFunc()
  new
  call SetOmniFunc()
  bw
  call test_garbagecollect_now()
  new
  set omnifunc=
  wincmd w
  set omnifunc=
  %bw!
  delfunc g:DictOmniFunc
  delfunc SetOmniFunc

  " Vim9 tests
  let lines =<< trim END
    vim9script

    def Vim9omniFunc(callnr: number, findstart: number, base: string): any
      add(g:Vim9omniFunc_Args, [callnr, findstart, base])
      return findstart ? 0 : []
    enddef

    # Test for using a def function with omnifunc
    set omnifunc=function('Vim9omniFunc',\ [60])
    new | only
    setline(1, 'one')
    g:Vim9omniFunc_Args = []
    feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    assert_equal([[60, 1, ''], [60, 0, 'one']], g:Vim9omniFunc_Args)
    bw!

    # Test for using a global function name
    &omnifunc = g:OmniFunc2
    new | only
    setline(1, 'two')
    g:OmniFunc2Args = []
    feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    assert_equal([[1, ''], [0, 'two']], g:OmniFunc2Args)
    bw!

    # Test for using a script-local function name
    def s:LocalOmniFunc(findstart: number, base: string): any
      add(g:LocalOmniFuncArgs, [findstart, base])
      return findstart ? 0 : []
    enddef
    &omnifunc = s:LocalOmniFunc
    new | only
    setline(1, 'three')
    g:LocalOmniFuncArgs = []
    feedkeys("A\<C-X>\<C-O>\<Esc>", 'x')
    assert_equal([[1, ''], [0, 'three']], g:LocalOmniFuncArgs)
    bw!
  END
  call CheckScriptSuccess(lines)

  " cleanup
  set omnifunc&
  delfunc OmniFunc1
  delfunc OmniFunc2
  unlet g:OmniFunc1Args g:OmniFunc2Args
  %bw!
endfunc

" Test for different ways of setting the 'thesaurusfunc' option
func Test_thesaurusfunc_callback()
  func TsrFunc1(callnr, findstart, base)
    call add(g:TsrFunc1Args, [a:callnr, a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc
  func TsrFunc2(findstart, base)
    call add(g:TsrFunc2Args, [a:findstart, a:base])
    return a:findstart ? 0 : ['sunday']
  endfunc

  let lines =<< trim END
    #" Test for using a function name
    LET &thesaurusfunc = 'g:TsrFunc2'
    new
    call setline(1, 'zero')
    LET g:TsrFunc2Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[1, ''], [0, 'zero']], g:TsrFunc2Args)
    bw!

    #" Test for using a function()
    set thesaurusfunc=function('g:TsrFunc1',\ [10])
    new
    call setline(1, 'one')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[10, 1, ''], [10, 0, 'one']], g:TsrFunc1Args)
    bw!

    #" Using a funcref variable to set 'thesaurusfunc'
    VAR Fn = function('g:TsrFunc1', [11])
    LET &thesaurusfunc = Fn
    new
    call setline(1, 'two')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[11, 1, ''], [11, 0, 'two']], g:TsrFunc1Args)
    bw!

    #" Using a string(funcref_variable) to set 'thesaurusfunc'
    LET Fn = function('g:TsrFunc1', [12])
    LET &thesaurusfunc = string(Fn)
    new
    call setline(1, 'two')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[12, 1, ''], [12, 0, 'two']], g:TsrFunc1Args)
    bw!

    #" Test for using a funcref()
    set thesaurusfunc=funcref('g:TsrFunc1',\ [13])
    new
    call setline(1, 'three')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[13, 1, ''], [13, 0, 'three']], g:TsrFunc1Args)
    bw!

    #" Using a funcref variable to set 'thesaurusfunc'
    LET Fn = funcref('g:TsrFunc1', [14])
    LET &thesaurusfunc = Fn
    new
    call setline(1, 'four')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[14, 1, ''], [14, 0, 'four']], g:TsrFunc1Args)
    bw!

    #" Using a string(funcref_variable) to set 'thesaurusfunc'
    LET Fn = funcref('g:TsrFunc1', [15])
    LET &thesaurusfunc = string(Fn)
    new
    call setline(1, 'four')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[15, 1, ''], [15, 0, 'four']], g:TsrFunc1Args)
    bw!

    #" Test for using a lambda function
    VAR optval = "LSTART a, b LMIDDLE TsrFunc1(16, a, b) LEND"
    LET optval = substitute(optval, ' ', '\\ ', 'g')
    exe "set thesaurusfunc=" .. optval
    new
    call setline(1, 'five')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[16, 1, ''], [16, 0, 'five']], g:TsrFunc1Args)
    bw!

    #" Test for using a lambda function with set
    LET &thesaurusfunc = LSTART a, b LMIDDLE TsrFunc1(17, a, b) LEND
    new
    call setline(1, 'six')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[17, 1, ''], [17, 0, 'six']], g:TsrFunc1Args)
    bw!

    #" Set 'thesaurusfunc' to a string(lambda expression)
    LET &thesaurusfunc = 'LSTART a, b LMIDDLE TsrFunc1(18, a, b) LEND'
    new
    call setline(1, 'six')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[18, 1, ''], [18, 0, 'six']], g:TsrFunc1Args)
    bw!

    #" Set 'thesaurusfunc' to a variable with a lambda expression
    VAR Lambda = LSTART a, b LMIDDLE TsrFunc1(19, a, b) LEND
    LET &thesaurusfunc = Lambda
    new
    call setline(1, 'seven')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[19, 1, ''], [19, 0, 'seven']], g:TsrFunc1Args)
    bw!

    #" Set 'thesaurusfunc' to a string(variable with a lambda expression)
    LET Lambda = LSTART a, b LMIDDLE TsrFunc1(20, a, b) LEND
    LET &thesaurusfunc = string(Lambda)
    new
    call setline(1, 'seven')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[20, 1, ''], [20, 0, 'seven']], g:TsrFunc1Args)
    bw!

    #" Test for using a lambda function with incorrect return value
    LET Lambda = LSTART a, b LMIDDLE strlen(a) LEND
    LET &thesaurusfunc = Lambda
    new
    call setline(1, 'eight')
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    bw!

    #" Test for clearing the 'thesaurusfunc' option
    set thesaurusfunc=''
    set thesaurusfunc&
    call assert_fails("set thesaurusfunc=function('abc')", "E700:")
    call assert_fails("set thesaurusfunc=funcref('abc')", "E700:")

    #" set 'thesaurusfunc' to a non-existing function
    set thesaurusfunc=TsrFunc2
    call setline(1, 'ten')
    call assert_fails("set thesaurusfunc=function('NonExistingFunc')", 'E700:')
    call assert_fails("LET &thesaurusfunc = function('NonExistingFunc')", 'E700:')
    LET g:TsrFunc2Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    call assert_equal([[1, ''], [0, 'ten']], g:TsrFunc2Args)
    bw!

    #" Use a buffer-local value and a global value
    set thesaurusfunc&
    setlocal thesaurusfunc=function('g:TsrFunc1',\ [22])
    call setline(1, 'sun')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", "x")
    call assert_equal('sun', getline(1))
    call assert_equal([[22, 1, ''], [22, 0, 'sun']], g:TsrFunc1Args)
    new
    call setline(1, 'sun')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", "x")
    call assert_equal('sun', getline(1))
    call assert_equal([], g:TsrFunc1Args)
    set thesaurusfunc=function('g:TsrFunc1',\ [23])
    wincmd w
    call setline(1, 'sun')
    LET g:TsrFunc1Args = []
    call feedkeys("A\<C-X>\<C-T>\<Esc>", "x")
    call assert_equal('sun', getline(1))
    call assert_equal([[22, 1, ''], [22, 0, 'sun']], g:TsrFunc1Args)
    :%bw!
  END
  call CheckLegacyAndVim9Success(lines)

  " Test for using a script-local function name
  func s:TsrFunc3(findstart, base)
    call add(g:TsrFunc3Args, [a:findstart, a:base])
    return a:findstart ? 0 : []
  endfunc
  set tsrfu=s:TsrFunc3
  new
  call setline(1, 'script1')
  let g:TsrFunc3Args = []
  call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
  call assert_equal([[1, ''], [0, 'script1']], g:TsrFunc3Args)
  bw!

  let &tsrfu = 's:TsrFunc3'
  new
  call setline(1, 'script2')
  let g:TsrFunc3Args = []
  call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
  call assert_equal([[1, ''], [0, 'script2']], g:TsrFunc3Args)
  bw!
  delfunc s:TsrFunc3

  " invalid return value
  let &thesaurusfunc = {a -> 'abc'}
  call feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')

  " Using Vim9 lambda expression in legacy context should fail
  set thesaurusfunc=(a,\ b)\ =>\ TsrFunc1(21,\ a,\ b)
  new | only
  let g:TsrFunc1Args = []
  call assert_fails('call feedkeys("A\<C-X>\<C-T>\<Esc>", "x")', 'E117:')
  call assert_equal([], g:TsrFunc1Args)
  bw!

  " set 'thesaurusfunc' to a partial with dict. This used to cause a crash.
  func SetTsrFunc()
    let params = {'thesaurus': function('g:DictTsrFunc')}
    let &thesaurusfunc = params.thesaurus
  endfunc
  func g:DictTsrFunc(_) dict
  endfunc
  call SetTsrFunc()
  new
  call SetTsrFunc()
  bw
  call test_garbagecollect_now()
  new
  set thesaurusfunc=
  wincmd w
  %bw!
  delfunc SetTsrFunc

  " set buffer-local 'thesaurusfunc' to a partial with dict. This used to
  " cause a crash.
  func SetLocalTsrFunc()
    let params = {'thesaurus': function('g:DictTsrFunc')}
    let &l:thesaurusfunc = params.thesaurus
  endfunc
  call SetLocalTsrFunc()
  call test_garbagecollect_now()
  call SetLocalTsrFunc()
  set thesaurusfunc=
  bw!
  delfunc g:DictTsrFunc
  delfunc SetLocalTsrFunc

  " Vim9 tests
  let lines =<< trim END
    vim9script

    def Vim9tsrFunc(callnr: number, findstart: number, base: string): any
      add(g:Vim9tsrFunc_Args, [callnr, findstart, base])
      return findstart ? 0 : []
    enddef

    # Test for using a def function with thesaurusfunc
    set thesaurusfunc=function('Vim9tsrFunc',\ [60])
    new | only
    setline(1, 'one')
    g:Vim9tsrFunc_Args = []
    feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    assert_equal([[60, 1, ''], [60, 0, 'one']], g:Vim9tsrFunc_Args)
    bw!

    # Test for using a global function name
    &thesaurusfunc = g:TsrFunc2
    new | only
    setline(1, 'two')
    g:TsrFunc2Args = []
    feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    assert_equal([[1, ''], [0, 'two']], g:TsrFunc2Args)
    bw!

    # Test for using a script-local function name
    def s:LocalTsrFunc(findstart: number, base: string): any
      add(g:LocalTsrFuncArgs, [findstart, base])
      return findstart ? 0 : []
    enddef
    &thesaurusfunc = s:LocalTsrFunc
    new | only
    setline(1, 'three')
    g:LocalTsrFuncArgs = []
    feedkeys("A\<C-X>\<C-T>\<Esc>", 'x')
    assert_equal([[1, ''], [0, 'three']], g:LocalTsrFuncArgs)
    bw!
  END
  call CheckScriptSuccess(lines)

  " cleanup
  set thesaurusfunc&
  delfunc TsrFunc1
  delfunc TsrFunc2
  unlet g:TsrFunc1Args g:TsrFunc2Args
  %bw!
endfunc

" vim: shiftwidth=2 sts=2 expandtab