Before:
  call ale#assert#SetUpLinterTest('markdown', 'mdl')

After:
  call ale#assert#TearDownLinterTest()

Execute(The default command should be correct):
  AssertLinter 'mdl', ale#Escape('mdl') . ' -j'

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

  AssertLinter 'foo bar', ale#Escape('foo bar') . ' -j --wat'

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

  AssertLinter 'path to/bundle', ale#Escape('path to/bundle') . ' exec mdl -j'