build: enable lintlua for test/ dir

Problem:
Not all Lua code is checked by stylua. Automating code-style is an
important mechanism for reducing time spent on accidental
(non-essential) complexity.

Solution:
- Enable stylua for entire `test/` directory.
- Exclude these high-churn files until this issue is resolved: https://github.com/JohnnyMorganz/StyLua/issues/829
  ```
  test/functional/ui/decorations_spec.lua  | 3560 ++++++++++++++++++++++++++++++++++++----------------
  test/functional/ui/float_spec.lua        | 5826 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------
  test/functional/ui/multigrid_spec.lua    | 1349 ++++++++++++++------
  ```
- Make surgical changes to these files (or add `stylua: ignore` in some
  small scopes) to improve the result:
  ```
  test/functional/vimscript/msgpack_functions_spec.lua | 1414 +++++++++++++++------
  test/functional/api/buffer_spec.lua                  | 1389 +++++++++++----------
  test/functional/api/vim_spec.lua                     | 2740 +++++++++++++++++++++++-----------------
  ```
- These "high churn" files are NOT excluded because the changes are
  largely an improvement:
  ```
  test/functional/plugin/lsp_spec.lua      | 2198 ++++++++++++++++++---------------
  test/functional/plugin/shada_spec.lua    | 4078 +++++++++++++++++++++++++++++++++++-------------------------
  test/functional/ui/cmdline_spec.lua      | 1199 +++++++++++-------
  test/functional/ui/popupmenu_spec.lua    | 1267 +++++++++++--------
  test/functional/ui/messages_spec.lua     | 1643 +++++++++++++++---------
  ```
- TODO: how to check "all directories"? With `GLOB_DIRS *` and `/.deps/` (or
  `.deps/`) in `.styluaignore`, Lua code in `.deps/` is still checked...

1 files changed, 10 insertions, 12 deletions

diff --git a/test/functional/core/spellfile_spec.lua b/test/functional/core/spellfile_spec.lua
index e3a59085cf..60cdf88fe3 100644
--- a/test/functional/core/spellfile_spec.lua
+++ b/test/functional/core/spellfile_spec.lua
@@ -25,6 +25,7 @@ describe('spellfile', function()
   local spellheader = 'VIMspell\050'
   it('errors out when prefcond section is truncated', function()
     meths.set_option_value('runtimepath', testdir, {})
+    -- stylua: ignore
     write_file(testdir .. '/spell/en.ascii.spl',
     --                         ┌ Section identifier (#SN_PREFCOND)
     --                         │   ┌ Section flags (#SNF_REQUIRED or zero)
@@ -35,11 +36,11 @@ describe('spellfile', function()
     --             │       │   ┌ Condition regex (missing!)
                .. '\000\001\001')
     meths.set_option_value('spelllang', 'en', {})
-    eq('Vim(set):E758: Truncated spell file',
-       exc_exec('set spell'))
+    eq('Vim(set):E758: Truncated spell file', exc_exec('set spell'))
   end)
   it('errors out when prefcond regexp contains NUL byte', function()
     meths.set_option_value('runtimepath', testdir, {})
+    -- stylua: ignore
     write_file(testdir .. '/spell/en.ascii.spl',
     --                         ┌ Section identifier (#SN_PREFCOND)
     --                         │   ┌ Section flags (#SNF_REQUIRED or zero)
@@ -55,11 +56,11 @@ describe('spellfile', function()
     --             │               │               ┌ PREFIXTREE tree length
                .. '\000\000\000\000\000\000\000\000\000\000\000\000')
     meths.set_option_value('spelllang', 'en', {})
-    eq('Vim(set):E759: Format error in spell file',
-       exc_exec('set spell'))
+    eq('Vim(set):E759: Format error in spell file', exc_exec('set spell'))
   end)
   it('errors out when region contains NUL byte', function()
     meths.set_option_value('runtimepath', testdir, {})
+    -- stylua: ignore
     write_file(testdir .. '/spell/en.ascii.spl',
     --                         ┌ Section identifier (#SN_REGION)
     --                         │   ┌ Section flags (#SNF_REQUIRED or zero)
@@ -72,11 +73,11 @@ describe('spellfile', function()
     --             │               │               ┌ PREFIXTREE tree length
                .. '\000\000\000\000\000\000\000\000\000\000\000\000')
     meths.set_option_value('spelllang', 'en', {})
-    eq('Vim(set):E759: Format error in spell file',
-       exc_exec('set spell'))
+    eq('Vim(set):E759: Format error in spell file', exc_exec('set spell'))
   end)
   it('errors out when SAL section contains NUL byte', function()
     meths.set_option_value('runtimepath', testdir, {})
+    -- stylua: ignore
     write_file(testdir .. '/spell/en.ascii.spl',
     --                         ┌ Section identifier (#SN_SAL)
     --                         │   ┌ Section flags (#SNF_REQUIRED or zero)
@@ -96,15 +97,12 @@ describe('spellfile', function()
     --             │               │               ┌ PREFIXTREE tree length
                .. '\000\000\000\000\000\000\000\000\000\000\000\000')
     meths.set_option_value('spelllang', 'en', {})
-    eq('Vim(set):E759: Format error in spell file',
-       exc_exec('set spell'))
+    eq('Vim(set):E759: Format error in spell file', exc_exec('set spell'))
   end)
   it('errors out when spell header contains NUL bytes', function()
     meths.set_option_value('runtimepath', testdir, {})
-    write_file(testdir .. '/spell/en.ascii.spl',
-               spellheader:sub(1, -3) .. '\000\000')
+    write_file(testdir .. '/spell/en.ascii.spl', spellheader:sub(1, -3) .. '\000\000')
     meths.set_option_value('spelllang', 'en', {})
-    eq('Vim(set):E757: This does not look like a spell file',
-       exc_exec('set spell'))
+    eq('Vim(set):E757: This does not look like a spell file', exc_exec('set spell'))
   end)
 end)