Before:
  runtime ale_linters/rst/rstcheck.vim

After:
  call ale#linter#Reset()

Execute(Warning and error messages should be handled correctly):
  " For some reason we can't set the directory such that the filenames are
  " correct here when running the tests from the Docker image, so we have to
  " just check the basenames of the files instead.
  AssertEqual
  \ [
  \   {
  \      'filename': 'bad_python.rst',
  \      'lnum': 7,
  \      'col': 0,
  \      'type': 'W',
  \      'text': '(python) unexpected EOF while parsing',
  \   },
  \   {
  \      'filename': 'bad_cpp.rst',
  \      'lnum': 9,
  \      'col': 0,
  \      'type': 'W',
  \      'text': '(cpp) error: ''x'' was not declared in this scope',
  \   },
  \   {
  \      'filename': 'bad_rst.rst',
  \      'lnum': 1,
  \      'col': 0,
  \      'type': 'E',
  \      'text': 'Title overline & underline mismatch.',
  \   },
  \ ],
  \ map(
  \   ale_linters#rst#rstcheck#Handle(1, [
  \     'bad_python.rst:7: (ERROR/3) (python) unexpected EOF while parsing',
  \     'bad_cpp.rst:9: (ERROR/3) (cpp) error: ''x'' was not declared in this scope',
  \     'bad_rst.rst:1: (SEVERE/4) Title overline & underline mismatch.',
  \   ]),
  \   'extend(v:val, {''filename'': fnamemodify(v:val.filename, '':t'')})'
  \ )