Before:
  Save g:ale_markdown_mdl_executable
  Save g:ale_markdown_mdl_options

  unlet! g:ale_markdown_mdl_executable
  unlet! g:ale_markdown_mdl_options

  runtime ale_linters/markdown/mdl.vim

After:
  Restore

  call ale#linter#Reset()

Execute(The default command should be correct):
  AssertEqual ale_linters#markdown#mdl#GetExecutable(bufnr('')), 'mdl'
  AssertEqual
  \ ale_linters#markdown#mdl#GetCommand(bufnr('')),
  \ ale#Escape('mdl')

Execute(The executable and options should be configurable):
  let g:ale_markdown_mdl_executable = 'foo bar'
  let g:ale_markdown_mdl_options = '--wat'

  AssertEqual ale_linters#markdown#mdl#GetExecutable(bufnr('')), 'foo bar'
  AssertEqual
  \ ale_linters#markdown#mdl#GetCommand(bufnr('')),
  \ ale#Escape('foo bar') . ' --wat'

Execute(Setting bundle appends 'exec mdl'):
  let g:ale_markdown_mdl_executable = 'path to/bundle'

  AssertEqual
  \ ale#Escape('path to/bundle') . ' exec mdl',
  \ ale_linters#markdown#mdl#GetCommand(bufnr(''))