docs: function report(test) {
    return {
      test_file: test.file + ': ' + test.fullTitle(),
      start: test.start,
      end: test.end,
      exit_code: test.exit_code,
      elapsed: test.duration / 1000,
      error: errorJSON(test.err || {}),
      url: test.url,
      status: test.state
    };
  }