Before:
  runtime ale_linters/lua/luacheck.vim

After:
  call ale#linter#Reset()
  let g:ale_lua_luacheck_options = ''
  let g:ale_lua_luacheck_executable = 'luacheck'

Execute(The lua luacheck command callback should return the correct default string):
  AssertEqual '''luacheck'' --formatter plain --codes --filename %s -',
  \ join(split(ale_linters#lua#luacheck#GetCommand(1)))

Execute(The lua luacheck command callback should let you set options):
  let g:ale_lua_luacheck_options = '--config filename'

  AssertEqual '''luacheck'' --config filename --formatter plain --codes --filename %s -',
  \ join(split(ale_linters#lua#luacheck#GetCommand(1)))

Execute(The luacheck executable should be configurable):
  let g:ale_lua_luacheck_executable = 'luacheck.sh'

  AssertEqual 'luacheck.sh', ale_linters#lua#luacheck#GetExecutable(1)
  AssertEqual '''luacheck.sh'' --formatter plain --codes --filename %s -',
  \ join(split(ale_linters#lua#luacheck#GetCommand(1)))