Before:
  runtime ale_linters/vala/vala_lint.vim

After:
  call ale#linter#Reset()

Execute(The Vala-Lint handler should parse lines correctly):
  AssertEqual
  \ [
  \   {
  \     'lnum': 18,
  \     'col': 18,
  \     'text': 'Expected space before paren',
  \     'code': 'space-before-paren',
  \     'type': 'E',
  \   },
  \   {
  \     'lnum': 64,
  \     'col': 37,
  \     'text': 'Expected space before paren',
  \     'code': 'space-before-paren',
  \     'type': 'W',
  \   },
  \   {
  \     'lnum': 73,
  \     'col': 37,
  \     'text': 'Expected space before paren',
  \     'code': 'space-before-paren',
  \     'type': 'E',
  \   },
  \ ],
  \ ale_linters#vala#vala_lint#Handle(bufnr(''), [
  \   'Application.vala',
  \   '   18.18    error   Expected space before paren                     space-before-paren',
  \   '   64.37    warn    Expected space before paren                     space-before-paren',
  \   '   73.37    error   Expected space before paren                     space-before-paren',
  \ ])

Execute(The Vala-Lint handler should ignore unknown error types):
  AssertEqual
  \ [
  \   {
  \     'lnum': 73,
  \     'col': 37,
  \     'text': 'Expected space before paren',
  \     'code': 'space-before-paren',
  \     'type': 'E',
  \   },
  \ ],
  \ ale_linters#vala#vala_lint#Handle(bufnr(''), [
  \   'Application.vala',
  \   '   18.18    test    Expected space before paren                     space-before-paren',
  \   '   73.37    error   Expected space before paren                     space-before-paren',
  \ ])