Before:
  runtime ale_linters/fortran/fortitude.vim

After:
  call ale#linter#Reset()

Execute(Simple fortitude handler run):
  AssertEqual
  \ [
  \   {
  \     'lnum': 3,
  \     'end_lnum': 3,
  \     'col': 5,
  \     'end_col': 18,
  \     'text': '''implicit none'' missing ''external''',
  \     'type': 'W',
  \     'code': 'C003',
  \   },
  \   {
  \     'col': 13,
  \     'end_col': 14,
  \     'end_lnum': 7,
  \     'lnum': 7,
  \     'text': 'Syntax error',
  \     'type': 'E',
  \     'code': 'E001',
  \   },
  \ ],
  \ ale_linters#fortran#fortitude#Handle(bufnr(''), [
  \   '[',
  \   json_encode({
  \     'code': 'C003',
  \     'end_location': {'column': 18, 'row': 3},
  \     'filename': '/home/user/documents/somefortranfile.f90',
  \     'fix': {
  \       'applicability': 'unsafe',
  \       'edits': [
  \         {
  \           'content': ' (type, external)',
  \           'end_location': {'column': 18, 'row': 3},
  \           'location': {'column': 18, 'row': 3},
  \         },
  \       ],
  \       'message': 'Add `(external)` to ''implicit none''',
  \     },
  \     'location': {'column': 5, 'row': 3},
  \     'message': '''implicit none'' missing ''external'''
  \   }),
  \   ',',
  \   json_encode({
  \     'code': 'E001',
  \     'end_location': {'column': 14, 'row': 7},
  \     'filename': '/home/user/documents/somefortranfile.f90',
  \     'fix': v:null,
  \     'location': {'column': 13, 'row': 7},
  \     'message': 'Syntax error',
  \   }),
  \   ']',
  \ ])