src/testdir/test_options.vim

" Test for options

source check.vim
source view_util.vim

func Test_whichwrap()
  set whichwrap=b,s
  call assert_equal('b,s', &whichwrap)

  set whichwrap+=h,l
  call assert_equal('b,s,h,l', &whichwrap)

  set whichwrap+=h,l
  call assert_equal('b,s,h,l', &whichwrap)

  set whichwrap+=h,l
  call assert_equal('b,s,h,l', &whichwrap)

  set whichwrap=h,h
  call assert_equal('h', &whichwrap)

  set whichwrap=h,h,h
  call assert_equal('h', &whichwrap)

  " For compatibility with Vim 3.0 and before, number values are also
  " supported for 'whichwrap'
  set whichwrap=1
  call assert_equal('b', &whichwrap)
  set whichwrap=2
  call assert_equal('s', &whichwrap)
  set whichwrap=4
  call assert_equal('h,l', &whichwrap)
  set whichwrap=8
  call assert_equal('<,>', &whichwrap)
  set whichwrap=16
  call assert_equal('[,]', &whichwrap)
  set whichwrap=31
  call assert_equal('b,s,h,l,<,>,[,]', &whichwrap)

  set whichwrap&
endfunc

func Test_isfname()
  " This used to cause Vim to access uninitialized memory.
  set isfname=
  call assert_equal("~X", expand("~X"))
  set isfname&
endfunc

func Test_wildchar()
  " Empty 'wildchar' used to access invalid memory.
  call assert_fails('set wildchar=', 'E521:')
  call assert_fails('set wildchar=abc', 'E521:')
  set wildchar=<Esc>
  let a=execute('set wildchar?')
  call assert_equal("\n  wildchar=<Esc>", a)
  set wildchar=27
  let a=execute('set wildchar?')
  call assert_equal("\n  wildchar=<Esc>", a)
  set wildchar&
endfunc

func Test_options_command()
  let caught = 'ok'
  try
    options
  catch
    let caught = v:throwpoint . "\n" . v:exception
  endtry
  call assert_equal('ok', caught)

  " Check if the option-window is opened horizontally.
  wincmd j
  call assert_notequal('option-window', bufname(''))
  wincmd k
  call assert_equal('option-window', bufname(''))
  " close option-window
  close

  " Open the option-window vertically.
  vert options
  " Check if the option-window is opened vertically.
  wincmd l
  call assert_notequal('option-window', bufname(''))
  wincmd h
  call assert_equal('option-window', bufname(''))
  " close option-window
  close

  " Open the option-window in a new tab.
  tab options
  " Check if the option-window is opened in a tab.
  normal gT
  call assert_notequal('option-window', bufname(''))
  normal gt
  call assert_equal('option-window', bufname(''))

  " close option-window
  close

  " Open the options window browse
  if has('browse')
    browse set
    call assert_equal('option-window', bufname(''))
    close
  endif
endfunc

func Test_path_keep_commas()
  " Test that changing 'path' keeps two commas.
  set path=foo,,bar
  set path-=bar
  set path+=bar
  call assert_equal('foo,,bar', &path)

  set path&
endfunc

func Test_signcolumn()
  if has('signs')
    call assert_equal("auto", &signcolumn)
    set signcolumn=yes
    set signcolumn=no
    call assert_fails('set signcolumn=nope')
  endif
endfunc

func Test_filetype_valid()
  set ft=valid_name
  call assert_equal("valid_name", &filetype)
  set ft=valid-name
  call assert_equal("valid-name", &filetype)

  call assert_fails(":set ft=wrong;name", "E474:")
  call assert_fails(":set ft=wrong\\\\name", "E474:")
  call assert_fails(":set ft=wrong\\|name", "E474:")
  call assert_fails(":set ft=wrong/name", "E474:")
  call assert_fails(":set ft=wrong\\\nname", "E474:")
  call assert_equal("valid-name", &filetype)

  exe "set ft=trunc\x00name"
  call assert_equal("trunc", &filetype)
endfunc

func Test_syntax_valid()
  if !has('syntax')
    return
  endif
  set syn=valid_name
  call assert_equal("valid_name", &syntax)
  set syn=valid-name
  call assert_equal("valid-name", &syntax)

  call assert_fails(":set syn=wrong;name", "E474:")
  call assert_fails(":set syn=wrong\\\\name", "E474:")
  call assert_fails(":set syn=wrong\\|name", "E474:")
  call assert_fails(":set syn=wrong/name", "E474:")
  call assert_fails(":set syn=wrong\\\nname", "E474:")
  call assert_equal("valid-name", &syntax)

  exe "set syn=trunc\x00name"
  call assert_equal("trunc", &syntax)
endfunc

func Test_keymap_valid()
  if !has('keymap')
    return
  endif
  call assert_fails(":set kmp=valid_name", "E544:")
  call assert_fails(":set kmp=valid_name", "valid_name")
  call assert_fails(":set kmp=valid-name", "E544:")
  call assert_fails(":set kmp=valid-name", "valid-name")

  call assert_fails(":set kmp=wrong;name", "E474:")
  call assert_fails(":set kmp=wrong\\\\name", "E474:")
  call assert_fails(":set kmp=wrong\\|name", "E474:")
  call assert_fails(":set kmp=wrong/name", "E474:")
  call assert_fails(":set kmp=wrong\\\nname", "E474:")

  call assert_fails(":set kmp=trunc\x00name", "E544:")
  call assert_fails(":set kmp=trunc\x00name", "trunc")
endfunc

func Check_dir_option(name)
  " Check that it's possible to set the option.
  exe 'set ' . a:name . '=/usr/share/dict/words'
  call assert_equal('/usr/share/dict/words', eval('&' . a:name))
  exe 'set ' . a:name . '=/usr/share/dict/words,/and/there'
  call assert_equal('/usr/share/dict/words,/and/there', eval('&' . a:name))
  exe 'set ' . a:name . '=/usr/share/dict\ words'
  call assert_equal('/usr/share/dict words', eval('&' . a:name))

  " Check rejecting weird characters.
  call assert_fails("set " . a:name . "=/not&there", "E474:")
  call assert_fails("set " . a:name . "=/not>there", "E474:")
  call assert_fails("set " . a:name . "=/not.*there", "E474:")
endfunc

func Test_cinkeys()
  " This used to cause invalid memory access
  set cindent cinkeys=0
  norm a
  set cindent& cinkeys&
endfunc

func Test_dictionary()
  call Check_dir_option('dictionary')
endfunc

func Test_thesaurus()
  call Check_dir_option('thesaurus')
endfun

func Test_complete()
  " Trailing single backslash used to cause invalid memory access.
  set complete=s\
  new
  call feedkeys("i\<C-N>\<Esc>", 'xt')
  bwipe!
  call assert_fails('set complete=ix', 'E535:')
  set complete&
endfun

func Test_set_completion()
  call feedkeys(":set di\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set dictionary diff diffexpr diffopt digraph directory display', @:)

  call feedkeys(":setlocal di\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"setlocal dictionary diff diffexpr diffopt digraph directory display', @:)

  call feedkeys(":setglobal di\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"setglobal dictionary diff diffexpr diffopt digraph directory display', @:)

  " Expand boolan options. When doing :set no<Tab>
  " vim displays the options names without "no" but completion uses "no...".
  call feedkeys(":set nodi\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set nodiff digraph', @:)

  call feedkeys(":set invdi\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set invdiff digraph', @:)

  " Expand abbreviation of options.
  call feedkeys(":set ts\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set tabstop thesaurus ttyscroll', @:)

  " Expand current value
  call feedkeys(":set fileencodings=\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set fileencodings=ucs-bom,utf-8,default,latin1', @:)

  call feedkeys(":set fileencodings:\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set fileencodings:ucs-bom,utf-8,default,latin1', @:)

  " Expand key codes.
  call feedkeys(":set <H\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set <Help> <Home>', @:)

  " Expand terminal options.
  call feedkeys(":set t_A\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set t_AB t_AF t_AL', @:)

  " Expand directories.
  call feedkeys(":set cdpath=./\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_match(' ./samples/ ', @:)
  call assert_notmatch(' ./small.vim ', @:)

  " Expand files and directories.
  call feedkeys(":set tags=./\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_match(' ./samples/.* ./small.vim', @:)

  call feedkeys(":set tags=./\\\\ dif\<C-A>\<C-B>\"\<CR>", 'tx')
  call assert_equal('"set tags=./\\ diff diffexpr diffopt', @:)

  set tags&
endfunc

func Test_set_errors()
  call assert_fails('set scroll=-1', 'E49:')
  call assert_fails('set backupcopy=', 'E474:')
  call assert_fails('set regexpengine=3', 'E474:')
  call assert_fails('set history=10001', 'E474:')
  call assert_fails('set numberwidth=21', 'E474:')
  call assert_fails('set colorcolumn=-a', 'E474:')
  call assert_fails('set colorcolumn=a', 'E474:')
  call assert_fails('set colorcolumn=1,', 'E474:')
  call assert_fails('set colorcolumn=1;', 'E474:')
  call assert_fails('set cmdheight=-1', 'E487:')
  call assert_fails('set cmdwinheight=-1', 'E487:')
  if has('conceal')
    call assert_fails('set conceallevel=-1', 'E487:')
    call assert_fails('set conceallevel=4', 'E474:')
  endif
  call assert_fails('set helpheight=-1', 'E487:')
  call assert_fails('set history=-1', 'E487:')
  call assert_fails('set report=-1', 'E487:')
  call assert_fails('set shiftwidth=-1', 'E487:')
  call assert_fails('set sidescroll=-1', 'E487:')
  call assert_fails('set tabstop=-1', 'E487:')
  call assert_fails('set textwidth=-1', 'E487:')
  call assert_fails('set timeoutlen=-1', 'E487:')
  call assert_fails('set updatecount=-1', 'E487:')
  call assert_fails('set updatetime=-1', 'E487:')
  call assert_fails('set winheight=-1', 'E487:')
  call assert_fails('set tabstop!', 'E488:')
  call assert_fails('set xxx', 'E518:')
  call assert_fails('set beautify?', 'E519:')
  call assert_fails('set undolevels=x', 'E521:')
  call assert_fails('set tabstop=', 'E521:')
  call assert_fails('set comments=-', 'E524:')
  call assert_fails('set comments=a', 'E525:')
  call assert_fails('set foldmarker=x', 'E536:')
  call assert_fails('set commentstring=x', 'E537:')
  call assert_fails('set complete=x', 'E539:')
  call assert_fails('set statusline=%{', 'E540:')
  call assert_fails('set statusline=' . repeat("%p", 81), 'E541:')
  call assert_fails('set statusline=%(', 'E542:')
  if has('cursorshape')
    " This invalid value for 'guicursor' used to cause Vim to crash.
    call assert_fails('set guicursor=i-ci,r-cr:h', 'E545:')
    call assert_fails('set guicursor=i-ci', 'E545:')
    call assert_fails('set guicursor=x', 'E545:')
    call assert_fails('set guicursor=x:', 'E546:')
    call assert_fails('set guicursor=r-cr:horx', 'E548:')
    call assert_fails('set guicursor=r-cr:hor0', 'E549:')
  endif
  if has('mouseshape')
    call assert_fails('se mouseshape=i-r:x', 'E547:')
  endif
  call assert_fails('set backupext=~ patchmode=~', 'E589:')
  call assert_fails('set winminheight=10 winheight=9', 'E591:')
  call assert_fails('set winminwidth=10 winwidth=9', 'E592:')
  call assert_fails("set showbreak=\x01", 'E595:')
  call assert_fails('set t_foo=', 'E846:')
  call assert_fails('set tabstop??', 'E488:')
  call assert_fails('set wrapscan!!', 'E488:')
  call assert_fails('set tabstop&&', 'E488:')
  call assert_fails('set wrapscan<<', 'E488:')
  call assert_fails('set wrapscan=1', 'E474:')
  call assert_fails('set autoindent@', 'E488:')
  call assert_fails('set wildchar=<abc>', 'E474:')
  call assert_fails('set cmdheight=1a', 'E521:')
  if has('python') && has('python3')
    call assert_fails('set pyxversion=6', 'E474:')
  endif
endfunc

func CheckWasSet(name)
  let verb_cm = execute('verbose set ' .. a:name .. '?')
  call assert_match('Last set from.*test_options.vim', verb_cm)
endfunc
func CheckWasNotSet(name)
  let verb_cm = execute('verbose set ' .. a:name .. '?')
  call assert_notmatch('Last set from', verb_cm)
endfunc

" Must be executed before other tests that set 'term'.
func Test_000_term_option_verbose()
  CheckNotGui

  call CheckWasNotSet('t_cm')

  let term_save = &term
  set term=ansi
  call CheckWasSet('t_cm')
  let &term = term_save
endfunc

func Test_copy_context()
  setlocal list
  call CheckWasSet('list')
  split
  call CheckWasSet('list')
  quit
  setlocal nolist

  set ai
  call CheckWasSet('ai')
  set filetype=perl
  call CheckWasSet('filetype')
  set fo=tcroq
  call CheckWasSet('fo')

  split Xsomebuf
  call CheckWasSet('ai')
  call CheckWasNotSet('filetype')
  call CheckWasSet('fo')
endfunc

func Test_set_ttytype()
  CheckUnix
  CheckNotGui

  " Setting 'ttytype' used to cause a double-free when exiting vim and
  " when vim is compiled with -DEXITFREE.
  set ttytype=ansi
  call assert_equal('ansi', &ttytype)
  call assert_equal(&ttytype, &term)
  set ttytype=xterm
  call assert_equal('xterm', &ttytype)
  call assert_equal(&ttytype, &term)
  " "set ttytype=" gives E522 instead of E529
  " in travis on some builds. Why?  Catch both for now
  try
    set ttytype=
    call assert_report('set ttytype= did not fail')
  catch /E529\|E522/
  endtry

  " Some systems accept any terminal name and return dumb settings,
  " check for failure of finding the entry and for missing 'cm' entry.
  try
    set ttytype=xxx
    call assert_report('set ttytype=xxx did not fail')
  catch /E522\|E437/
  endtry

  set ttytype&
  call assert_equal(&ttytype, &term)

  if has('gui') && !has('gui_running')
    call assert_fails('set term=gui', 'E531:')
  endif
endfunc

func Test_set_all()
  set tw=75
  set iskeyword=a-z,A-Z
  set nosplitbelow
  let out = execute('set all')
  call assert_match('textwidth=75', out)
  call assert_match('iskeyword=a-z,A-Z', out)
  call assert_match('nosplitbelow', out)
  set tw& iskeyword& splitbelow&
endfunc

func Test_set_one_column()
  let out_mult = execute('set all')->split("\n")
  let out_one = execute('set! all')->split("\n")
  call assert_true(len(out_mult) < len(out_one))
endfunc

func Test_set_values()
  if filereadable('opt_test.vim')
    source opt_test.vim
  else
    throw 'Skipped: opt_test.vim does not exist'
  endif
endfunc

func Test_renderoptions()
  " Only do this for Windows Vista and later, fails on Windows XP and earlier.
  " Doesn't hurt to do this on a non-Windows system.
  if windowsversion() !~ '^[345]\.'
    set renderoptions=type:directx
    set rop=type:directx
  endif
endfunc

func ResetIndentexpr()
  set indentexpr=
endfunc

func Test_set_indentexpr()
  " this was causing usage of freed memory
  set indentexpr=ResetIndentexpr()
  new
  call feedkeys("i\<c-f>", 'x')
  call assert_equal('', &indentexpr)
  bwipe!
endfunc

func Test_backupskip()
  " Option 'backupskip' may contain several comma-separated path
  " specifications if one or more of the environment variables TMPDIR, TMP,
  " or TEMP is defined.  To simplify testing, convert the string value into a
  " list.
  let bsklist = split(&bsk, ',')

  if has("mac")
    let found = (index(bsklist, '/private/tmp/*') >= 0)
    call assert_true(found, '/private/tmp not in option bsk: ' . &bsk)
  elseif has("unix")
    let found = (index(bsklist, '/tmp/*') >= 0)
    call assert_true(found, '/tmp not in option bsk: ' . &bsk)
  endif

  " If our test platform is Windows, the path(s) in option bsk will use
  " backslash for the path separator and the components could be in short
  " (8.3) format.  As such, we need to replace the backslashes with forward
  " slashes and convert the path components to long format.  The expand()
  " function will do this but it cannot handle comma-separated paths.  This is
  " why bsk was converted from a string into a list of strings above.
  "
  " One final complication is that the wildcard "/*" is at the end of each
  " path and so expand() might return a list of matching files.  To prevent
  " this, we need to remove the wildcard before calling expand() and then
  " append it afterwards.
  if has('win32')
    let item_nbr = 0
    while item_nbr < len(bsklist)
      let path_spec = bsklist[item_nbr]
      let path_spec = strcharpart(path_spec, 0, strlen(path_spec)-2)
      let path_spec = substitute(expand(path_spec), '\\', '/', 'g')
      let bsklist[item_nbr] = path_spec . '/*'
      let item_nbr += 1
    endwhile
  endif

  " Option bsk will also include these environment variables if defined.
  " If they're defined, verify they appear in the option value.
  for var in  ['$TMPDIR', '$TMP', '$TEMP']
    if exists(var)
      let varvalue = substitute(expand(var), '\\', '/', 'g')
      let varvalue = substitute(varvalue, '/$', '', '')
      let varvalue .= '/*'
      let found = (index(bsklist, varvalue) >= 0)
      call assert_true(found, var . ' (' . varvalue . ') not in option bsk: ' . &bsk)
    endif
  endfor

  " Duplicates should be filtered out (option has P_NODUP)
  let backupskip = &backupskip
  set backupskip=
  set backupskip+=/test/dir
  set backupskip+=/other/dir
  set backupskip+=/test/dir
  call assert_equal('/test/dir,/other/dir', &backupskip)
  let &backupskip = backupskip
endfunc

func Test_copy_winopt()
  set hidden

  " Test copy option from current buffer in window
  split
  enew
  setlocal numberwidth=5
  wincmd w
  call assert_equal(4,&numberwidth)
  bnext
  call assert_equal(5,&numberwidth)
  bw!
  call assert_equal(4,&numberwidth)

  " Test copy value from window that used to be display the buffer
  split
  enew
  setlocal numberwidth=6
  bnext
  wincmd w
  call assert_equal(4,&numberwidth)
  bnext
  call assert_equal(6,&numberwidth)
  bw!

  " Test that if buffer is current, don't use the stale cached value
  " from the last time the buffer was displayed.
  split
  enew
  setlocal numberwidth=7
  bnext
  bnext
  setlocal numberwidth=8
  wincmd w
  call assert_equal(4,&numberwidth)
  bnext
  call assert_equal(8,&numberwidth)
  bw!

  " Test value is not copied if window already has seen the buffer
  enew
  split
  setlocal numberwidth=9
  bnext
  setlocal numberwidth=10
  wincmd w
  call assert_equal(4,&numberwidth)
  bnext
  call assert_equal(4,&numberwidth)
  bw!

  set hidden&
endfunc

func Test_shortmess_F()
  new
  call assert_match('\[No Name\]', execute('file'))
  set shortmess+=F
  call assert_match('\[No Name\]', execute('file'))
  call assert_match('^\s*$', execute('file foo'))
  call assert_match('foo', execute('file'))
  set shortmess-=F
  call assert_match('bar', execute('file bar'))
  call assert_match('bar', execute('file'))
  set shortmess&
  bwipe
endfunc

func Test_shortmess_F2()
  e file1
  e file2
  call assert_match('file1', execute('bn', ''))
  call assert_match('file2', execute('bn', ''))
  set shortmess+=F
  call assert_true(empty(execute('bn', '')))
  call assert_false(test_getvalue('need_fileinfo'))
  call assert_true(empty(execute('bn', '')))
  call assert_false('need_fileinfo'->test_getvalue())
  set hidden
  call assert_true(empty(execute('bn', '')))
  call assert_false(test_getvalue('need_fileinfo'))
  call assert_true(empty(execute('bn', '')))
  call assert_false(test_getvalue('need_fileinfo'))
  set nohidden
  call assert_true(empty(execute('bn', '')))
  call assert_false(test_getvalue('need_fileinfo'))
  call assert_true(empty(execute('bn', '')))
  call assert_false(test_getvalue('need_fileinfo'))
  set shortmess&
  call assert_match('file1', execute('bn', ''))
  call assert_match('file2', execute('bn', ''))
  bwipe
  bwipe
endfunc

func Test_local_scrolloff()
  set so=5
  set siso=7
  split
  call assert_equal(5, &so)
  setlocal so=3
  call assert_equal(3, &so)
  wincmd w
  call assert_equal(5, &so)
  wincmd w
  setlocal so<
  call assert_equal(5, &so)
  setlocal so=0
  call assert_equal(0, &so)
  setlocal so=-1
  call assert_equal(5, &so)

  call assert_equal(7, &siso)
  setlocal siso=3
  call assert_equal(3, &siso)
  wincmd w
  call assert_equal(7, &siso)
  wincmd w
  setlocal siso<
  call assert_equal(7, &siso)
  setlocal siso=0
  call assert_equal(0, &siso)
  setlocal siso=-1
  call assert_equal(7, &siso)

  close
  set so&
  set siso&
endfunc

func Test_writedelay()
  CheckFunction reltimefloat

  new
  call setline(1, 'empty')
  redraw
  set writedelay=10
  let start = reltime()
  call setline(1, repeat('x', 70))
  redraw
  let elapsed = reltimefloat(reltime(start))
  set writedelay=0
  " With 'writedelay' set should take at least 30 * 10 msec
  call assert_inrange(30 * 0.01, 999.0, elapsed)

  bwipe!
endfunc

func Test_visualbell()
  set belloff=
  set visualbell
  call assert_beeps('normal 0h')
  set novisualbell
  set belloff=all
endfunc

" Test for the 'write' option
func Test_write()
  new
  call setline(1, ['L1'])
  set nowrite
  call assert_fails('write Xfile', 'E142:')
  set write
  close!
endfunc

" Test for 'buftype' option
func Test_buftype()
  new
  call setline(1, ['L1'])
  set buftype=nowrite
  call assert_fails('write', 'E382:')

  for val in ['', 'nofile', 'nowrite', 'acwrite', 'quickfix', 'help', 'terminal', 'prompt', 'popup']
    exe 'set buftype=' .. val
    call writefile(['something'], 'XBuftype')
    call assert_fails('write XBuftype', 'E13:', 'with buftype=' .. val)
  endfor

  call delete('XBuftype')
  bwipe!
endfunc

" Test for the 'shell' option
func Test_shell()
  CheckUnix
  let save_shell = &shell
  set shell=
  call assert_fails('shell', 'E91:')
  let &shell = save_shell
endfunc

" Test for the 'shellquote' option
func Test_shellquote()
  CheckUnix
  set shellquote=#
  set verbose=20
  redir => v
  silent! !echo Hello
  redir END
  set verbose&
  set shellquote&
  call assert_match(': "#echo Hello#"', v)
endfunc

" Test for the 'rightleftcmd' option
func Test_rightleftcmd()
  CheckFeature rightleft
  set rightleft
  set rightleftcmd

  let g:l = []
  func AddPos()
    call add(g:l, screencol())
    return ''
  endfunc
  cmap <expr> <F2> AddPos()

  call feedkeys("/\<F2>abc\<Left>\<F2>\<Right>\<Right>\<F2>" ..
        \ "\<Left>\<F2>\<Esc>", 'xt')
  call assert_equal([&co - 1, &co - 4, &co - 2, &co - 3], g:l)

  cunmap <F2>
  unlet g:l
  set rightleftcmd&
  set rightleft&
endfunc

" Test for the "debug" option
func Test_debug_option()
  set debug=beep
  exe "normal \<C-c>"
  call assert_equal('Beep!', Screenline(&lines))
  set debug&
endfunc

" Test for the default CDPATH option
func Test_opt_default_cdpath()
  CheckFeature file_in_path
  let after =<< trim [CODE]
    call assert_equal(',/path/to/dir1,/path/to/dir2', &cdpath)
    call writefile(v:errors, 'Xtestout')
    qall
  [CODE]
  if has('unix')
    let $CDPATH='/path/to/dir1:/path/to/dir2'
  else
    let $CDPATH='/path/to/dir1;/path/to/dir2'
  endif
  if RunVim([], after, '')
    call assert_equal([], readfile('Xtestout'))
    call delete('Xtestout')
  endif
endfunc

" Test for setting keycodes using set
func Test_opt_set_keycode()
  call assert_fails('set <t_k1=l', 'E474:')
  call assert_fails('set <Home=l', 'E474:')
  set <t_k9>=abcd
  call assert_equal('abcd', &t_k9)
  set <t_k9>&
  set <F9>=xyz
  call assert_equal('xyz', &t_k9)
  set <t_k9>&
endfunc

" Test for changing options in a sandbox
func Test_opt_sandbox()
  for opt in ['backupdir', 'cdpath', 'exrc']
    call assert_fails('sandbox set ' .. opt .. '?', 'E48:')
  endfor
endfunc

" Test for setting an option with local value to global value
func Test_opt_local_to_global()
  setglobal equalprg=gprg
  setlocal equalprg=lprg
  call assert_equal('gprg', &g:equalprg)
  call assert_equal('lprg', &l:equalprg)
  call assert_equal('lprg', &equalprg)
  set equalprg<
  call assert_equal('', &l:equalprg)
  call assert_equal('gprg', &equalprg)
  setglobal equalprg=gnewprg
  setlocal equalprg=lnewprg
  setlocal equalprg<
  call assert_equal('gnewprg', &l:equalprg)
  call assert_equal('gnewprg', &equalprg)
  set equalprg&
endfunc

" Test for incrementing, decrementing and multiplying a number option value
func Test_opt_num_op()
  set shiftwidth=4
  set sw+=2
  call assert_equal(6, &sw)
  set sw-=2
  call assert_equal(4, &sw)
  set sw^=2
  call assert_equal(8, &sw)
  set shiftwidth&
endfunc

" vim: shiftwidth=2 sts=2 expandtab