Function _getQueryResultForElement

src/cdk/testing/harness-environment.ts:420–434

* Check whether the given query matches the given element, if it does return the matched * `TestElement` or `ComponentHarness`, if it does not, return null. In cases where the caller * knows for sure that the query matches the element's selector, `skipSelectorCheck` can be used * to skip ve

(
    query: string | HarnessPredicate<T>,
    rawElement: E,
    testElement: TestElement,
    skipSelectorCheck: boolean = false,
  )

   * to skip verification and optimize performance.
   */
  private async _getQueryResultForElement<T extends ComponentHarness>(
    query: string | HarnessPredicate<T>,
    rawElement: E,
    testElement: TestElement,
    skipSelectorCheck: boolean = false,
  ): Promise<T | TestElement | null> {
    if (typeof query === 'string') {
      return skipSelectorCheck || (await testElement.matchesSelector(query)) ? testElement : null;
    }
    if (skipSelectorCheck || (await testElement.matchesSelector(query.getSelector()))) {
      const harness = this.createComponentHarness(query.harnessType, rawElement);
      return (await query.evaluate(harness)) ? harness : null;
    }
    return null;
  }
}

/**