Before:
  call ale#assert#SetUpFixerTest('markdown', 'markdownlint')

After:
  call ale#assert#TearDownFixerTest()

Execute(The default command should use a temporary file):
  AssertFixer {
  \ 'command': ale#Escape('markdownlint') . ' --fix %t',
  \ 'read_temporary_file': 1,
  \}

Execute(The executable should be configurable):
  let g:ale_markdownlint_executable = 'custom_markdownlint'

  AssertFixer {
  \ 'command': ale#Escape('custom_markdownlint') . ' --fix %t',
  \ 'read_temporary_file': 1,
  \}

Execute(Custom options should not remove the required --fix option):
  let g:ale_markdownlint_executable = 'markdownlint'
  let g:ale_markdownlint_options = '--quiet'

  AssertFixer {
  \ 'command': ale#Escape('markdownlint') . ' --fix --quiet %t',
  \ 'read_temporary_file': 1,
  \}