Execute(The handler should return an empty list with empty input):
  AssertEqual [], ale#handlers#scala#HandleScalacLintFormat(bufnr(''), [])

Execute(The handler should correctly parse error messages):
  AssertEqual
  \ [
  \   {
  \     'lnum': 4,
  \     'col':  8,
  \     'text': ''':'' expected but identifier found.',
  \     'type': 'E'
  \   },
  \   {
  \     'lnum': 6,
  \     'col':  2,
  \     'text': 'identifier expected but eof found.',
  \     'type': 'E'
  \   }
  \ ],
  \ ale#handlers#scala#HandleScalacLintFormat(bufnr(''),
  \ [
  \ "hi.scala:4: error: ':' expected but identifier found.",
  \ "  Some stupid scala code",
  \ "       ^",
  \ "hi.scala:6: error: identifier expected but eof found.",
  \ ")",
  \ " ^",
  \ "two errors found",
  \ ])