Function getChildLoader

src/cdk/testing/harness-environment.ts:313–319

* Searches for an element with the given selector under the evironment's root element, * and returns a `HarnessLoader` rooted at the matching element. If multiple elements match the * selector, the first is used. If no elements match, an error is thrown. * @param selector The selector for t

(selector: string)

   * @throws If a matching element can't be found.
   */
  async getChildLoader(selector: string): Promise<HarnessLoader> {
    return this.createEnvironment(
      await _assertResultFound(this.getAllRawElements(selector), [
        _getDescriptionForHarnessLoaderQuery(selector),
      ]),
    );
  }

  /**
   * Searches for all elements with the given selector under the environment's root element,