neovim/test/functional/ex_cmds/syntax_spec.lua

local helpers = require('test.functional.helpers')(after_each)

local eq = helpers.eq
local clear = helpers.clear
local exc_exec = helpers.exc_exec

describe(':syntax', function()
  before_each(clear)

  describe('keyword', function()
    it('does not crash when group name contains unprintable characters',
    function()
      eq('Vim(syntax):E669: Unprintable character in group name',
         exc_exec('syntax keyword \024 foo bar'))
    end)
  end)
end)