test(oldtest): uncomment method call syntax uses

We should now be equal with Vim in regards to method call support of already ported built-ins.

Enable all relevant commented-out uses of the syntax in tests that I could grep.

src/nvim/testdir/test_autocmd.vim

@@ -526,8 +526,7 @@ func Test_autocmd_blast_badd()
 
   call writefile(content, 'XblastBall')
   call system(GetVimCommand() .. ' --clean -S XblastBall')
-  " call assert_match('OK', readfile('Xerrors')->join())
-  call assert_match('OK', join(readfile('Xerrors')))
+  call assert_match('OK', readfile('Xerrors')->join())
 
   call delete('XblastBall')
   call delete('Xerrors')

src/nvim/testdir/test_compiler.vim

@@ -38,10 +38,9 @@ func Test_compiler()
 endfunc
 
 func GetCompilerNames()
-  " return glob('$VIMRUNTIME/compiler/*.vim', 0, 1)
-  "      \ ->map({i, v -> substitute(v, '.*[\\/]\([a-zA-Z0-9_\-]*\).vim', '\1', '')})
-  "      \ ->sort()
-  return sort(map(glob('$VIMRUNTIME/compiler/*.vim', 0, 1), {i, v -> substitute(v, '.*[\\/]\([a-zA-Z0-9_\-]*\).vim', '\1', '')}))
+  return glob('$VIMRUNTIME/compiler/*.vim', 0, 1)
+       \ ->map({i, v -> substitute(v, '.*[\\/]\([a-zA-Z0-9_\-]*\).vim', '\1', '')})
+       \ ->sort()
 endfunc
 
 func Test_compiler_without_arg()
@@ -54,8 +53,7 @@ func Test_compiler_without_arg()
 endfunc
 
 func Test_compiler_completion()
-  " let clist = GetCompilerNames()->join(' ')
-  let clist = join(GetCompilerNames(), ' ')
+  let clist = GetCompilerNames()->join(' ')
   call feedkeys(":compiler \<C-A>\<C-B>\"\<CR>", 'tx')
   call assert_match('^"compiler ' .. clist .. '$', @:)
 

src/nvim/testdir/test_fold.vim

@@ -809,8 +809,7 @@ func Test_undo_fold_deletion()
   g/"/d
   undo
   redo
-  " eval getline(1, '$')->assert_equal([''])
-  eval assert_equal(getline(1, '$'), [''])
+  eval getline(1, '$')->assert_equal([''])
 
   set fdm&vim
   bwipe!

src/nvim/testdir/test_mksession.vim

@@ -156,8 +156,7 @@ func Test_mksession_zero_winheight()
   wincmd _
   mksession! Xtest_mks_zero
   set winminheight&
-  " let text = readfile('Xtest_mks_zero')->join()
-  let text = join(readfile('Xtest_mks_zero'))
+  let text = readfile('Xtest_mks_zero')->join()
   call delete('Xtest_mks_zero')
   close
   " check there is no divide by zero

src/nvim/testdir/test_options.vim

@@ -235,8 +235,7 @@ func Test_set_completion()
   call feedkeys(":set filetype=sshdconfi\<Tab>\<C-B>\"\<CR>", 'xt')
   call assert_equal('"set filetype=sshdconfig', @:)
   call feedkeys(":set filetype=a\<C-A>\<C-B>\"\<CR>", 'xt')
-  " call assert_equal('"set filetype=' .. getcompletion('a*', 'filetype')->join(), @:)
-  call assert_equal('"set filetype=' .. join(getcompletion('a*', 'filetype')), @:)
+  call assert_equal('"set filetype=' .. getcompletion('a*', 'filetype')->join(), @:)
 endfunc
 
 func Test_set_errors()

src/nvim/testdir/test_spell_utf8.vim

@@ -512,8 +512,7 @@ func TestGoodBadBase()
       break
     endif
     let prevbad = bad
-    " let lst = bad->spellsuggest(3)
-    let lst = spellsuggest(bad, 3)
+    let lst = bad->spellsuggest(3)
     normal mm
 
     call add(result, [bad, lst])
@@ -552,8 +551,7 @@ func Test_spell_basic()
         \ )
 
   call assert_equal("gebletegek", soundfold('goobledygoook'))
-  " call assert_equal("kepereneven", 'kóopërÿnôven'->soundfold())
-  call assert_equal("kepereneven", soundfold('kóopërÿnôven'))
+  call assert_equal("kepereneven", 'kóopërÿnôven'->soundfold())
   call assert_equal("everles gesvets etele", soundfold('oeverloos gezwets edale'))
 endfunc
 

src/nvim/testdir/test_startup.vim

@@ -905,15 +905,13 @@ func Test_not_a_term()
   " This will take 2 seconds because of the missing --not-a-term
   let cmd = GetVimProg() .. ' --cmd quit ' .. redir
   exe "silent !" . cmd
-  " call assert_match("\<Esc>", readfile('Xvimout')->join())
-  call assert_match("\<Esc>", join(readfile('Xvimout')))
+  call assert_match("\<Esc>", readfile('Xvimout')->join())
   call delete('Xvimout')
 
   " With --not-a-term there are no escape sequences.
   let cmd = GetVimProg() .. ' --not-a-term --cmd quit ' .. redir
   exe "silent !" . cmd
-  " call assert_notmatch("\<Esc>", readfile('Xvimout')->join())
-  call assert_notmatch("\<Esc>", join(readfile('Xvimout')))
+  call assert_notmatch("\<Esc>", readfile('Xvimout')->join())
   call delete('Xvimout')
 endfunc
 

src/nvim/testdir/test_substitute.vim

@@ -752,8 +752,7 @@ endfunc
 func Test_submatch_list_concatenate()
   let pat = 'A\(.\)'
   let Rep = {-> string([submatch(0, 1)] + [[submatch(1)]])}
-  " call substitute('A1', pat, Rep, '')->assert_equal("[['A1'], ['1']]")
-  call assert_equal(substitute('A1', pat, Rep, ''), "[['A1'], ['1']]")
+  call substitute('A1', pat, Rep, '')->assert_equal("[['A1'], ['1']]")
 endfunc
 
 func Test_substitute_skipped_range()

src/nvim/testdir/test_syntax.vim

@@ -30,23 +30,17 @@ func AssertHighlightGroups(lnum, startcol, expected, trans = 1, msg = "")
   " If groups are provided as a string, each character is assumed to be a
   " group and spaces represent no group, useful for visually describing tests.
   let l:expectedGroups = type(a:expected) == v:t_string
-        "\ ? a:expected->split('\zs')->map({_, v -> trim(v)})
-        \ ? map(split(a:expected, '\zs'), {_, v -> trim(v)})
+        \ ? a:expected->split('\zs')->map({_, v -> trim(v)})
         \ : a:expected
   let l:errors = 0
-  " let l:msg = (a:msg->empty() ? "" : a:msg .. ": ")
-  let l:msg = (empty(a:msg) ? "" : a:msg .. ": ")
+  let l:msg = (a:msg->empty() ? "" : a:msg .. ": ")
         \ .. "Wrong highlight group at " .. a:lnum .. ","
 
-  " for l:i in range(a:startcol, a:startcol + l:expectedGroups->len() - 1)
-  "   let l:errors += synID(a:lnum, l:i, a:trans)
-  "        \ ->synIDattr("name")
-  "        \ ->assert_equal(l:expectedGroups[l:i - 1],
-  for l:i in range(a:startcol, a:startcol + len(l:expectedGroups) - 1)
-    let l:errors +=
-          \ assert_equal(synIDattr(synID(a:lnum, l:i, a:trans), "name"),
-          \    l:expectedGroups[l:i - 1],
-          \    l:msg .. l:i)
+  for l:i in range(a:startcol, a:startcol + l:expectedGroups->len() - 1)
+    let l:errors += synID(a:lnum, l:i, a:trans)
+         \ ->synIDattr("name")
+         \ ->assert_equal(l:expectedGroups[l:i - 1],
+         \    l:msg .. l:i)
   endfor
 endfunc
 

src/nvim/testdir/test_system.vim

@@ -121,8 +121,7 @@ func Test_system_with_shell_quote()
         let msg = printf('shell=%s shellxquote=%s', &shell, &shellxquote)
 
         try
-          " let out = 'echo 123'->system()
-          let out = system('echo 123')
+          let out = 'echo 123'->system()
         catch
           call assert_report(printf('%s: %s', msg, v:exception))
           continue