Before:
  runtime ale_linters/zeek/zeek.vim

After:
  call ale#linter#Reset()

Execute(The zeek handler should parse errors correctly):
  AssertEqual
  \ [
  \   {
  \     'lnum': 2,
  \     'text': 'unknown identifier bar, at or near "bar"',
  \     'type': 'E',
  \   },
  \ ],
  \ ale_linters#zeek#zeek#HandleErrors(bufnr(''), [
  \ 'error in /tmp/foo.zeek, line 2: unknown identifier bar, at or near "bar"'
  \ ])

Execute(The zeek handler should parse warnings correctly):
  AssertEqual
  \ [
  \   {
  \     'lnum': 11,
  \     'text': 'expression value ignored (c$removal_hooks)',
  \     'type': 'W',
  \   },
  \ ],
  \ ale_linters#zeek#zeek#HandleErrors(bufnr(''), [
  \ 'warning in /tmp/bar.zeek, line 11: expression value ignored (c$removal_hooks)'
  \ ])