Before:
    runtime ale_linters/fish/fish.vim

After:
    call ale#linter#Reset()

Execute(The fish handler should handle basic warnings and syntax errors):
  AssertEqual
  \ [
  \   {
  \     'lnum': 20,
  \     'col': 23,
  \     'text': "Unsupported use of '||'. In fish, please use 'COMMAND; or COMMAND'.",
  \   },
  \   {
  \     'lnum': 26,
  \     'col': 7,
  \     'text': "Illegal command name '(prompt_pwd)'",
  \   },
  \   {
  \     'lnum': 36,
  \     'col': 1,
  \     'text': "'end' outside of a block",
  \   },
  \ ],
  \ ale_linters#fish#fish#Handle(1, [
  \    "fish_prompt.fish (line 20): Unsupported use of '||'. In fish, please use 'COMMAND; or COMMAND'.",
  \    'if set -q SSH_CLIENT || set -q SSH_TTY',
  \    '                      ^',
  \    "fish_prompt.fish (line 26): Illegal command name '(prompt_pwd)'",
  \    '      (prompt_pwd) \',
  \    '      ^',
  \    "fish_prompt.fish (line 36): 'end' outside of a block",
  \    'end',
  \    '^',
  \    'config.fish (line 45):',
  \    "abbr --add p 'cd ~/Projects'",
  \    '^',
  \ ])

Execute(The fish handler should handle problems where the problem before before the line with the line number):
  AssertEqual
  \ [
  \   {
  \     'lnum': 2,
  \     'col': 23,
  \     'text': 'Unsupported use of ''||''. In fish, please use ''COMMAND; or COMMAND''.',
  \   },
  \   {
  \     'lnum': 5,
  \     'col': 1,
  \     'text': 'wat',
  \   },
  \ ],
  \ ale_linters#fish#fish#Handle(bufnr(''), [
  \   'Unsupported use of ''||''. In fish, please use ''COMMAND; or COMMAND''.',
  \   '/tmp/vLz620o/258/test.fish (line 2): if set -q SSH_CLIENT || set -q SSH_TTY',
  \   '                                                           ^',
  \   '/tmp/vLz620o/258/test.fish (line 5): wat',
  \   '                                     ^',
  \ ])