async onTestDone(testSummary) {
    this.context.testSummary = testSummary;

    if (testSummary.status === 'failed') {
      this._hasFailingTests = true;
    }
  }
@protected
@async
@param {TestSummary} testSummary - has name and status of test that ran
@return {Promise<void>} - when done