Before:
  runtime ale_linters/swift/swiftformat.vim

After:
  call ale#linter#Reset()

Execute(The swiftformat handler should parse lines correctly):
  AssertEqual
  \ [
  \   {
  \     'lnum': 4,
  \     'col': 21,
  \     'type': 'W',
  \     'code': 'DoNotUseSemicolons',
  \     'text': 'remove '';'' and move the next statement to the new line',
  \   },
  \   {
  \     'lnum': 3,
  \     'col': 12,
  \     'type': 'W',
  \     'code': 'Spacing',
  \     'text': 'remove 1 space'
  \   },
  \ ],
  \ ale_linters#swift#swiftformat#Handle(bufnr(''), [
  \   'Sources/main.swift:4:21: warning: [DoNotUseSemicolons]: remove '';'' and move the next statement to the new line',
  \   'Sources/main.swift:3:12: warning: [Spacing]: remove 1 space',
  \ ])