Method constructor

src/cdk/testing/component-harness.ts:608–622

(
    public harnessType: ComponentHarnessConstructor<T>,
    options: BaseHarnessFilters,
  )

  private _ancestor: string;

  constructor(
    public harnessType: ComponentHarnessConstructor<T>,
    options: BaseHarnessFilters,
  ) {
    this._ancestor = options.ancestor || '';
    if (this._ancestor) {
      this._descriptions.push(`has ancestor matching selector "${this._ancestor}"`);
    }
    const selector = options.selector;
    if (selector !== undefined) {
      this.add(`host matches selector "${selector}"`, async item => {
        return (await item.host()).matchesSelector(selector);
      });
    }
  }

  /**
   * Checks if the specified nullable string value matches the given pattern.