/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {ComponentHarness} from '@angular/cdk-experimental/testing';
import {coerceNumberProperty} from '@angular/cdk/coercion';

/**
 * Harness for interacting with a standard mat-progress-bar in tests.
 * @dynamic
 */
export class MatProgressBarHarness extends ComponentHarness {
  static hostSelector = 'mat-progress-bar';

  /** Gets a promise for the progress bar's value. */
  async getValue(): Promise<number|null> {
    const host = await this.host();
    const ariaValue = await host.getAttribute('aria-valuenow');
    return ariaValue ? coerceNumberProperty(ariaValue) : null;
  }

  /** Gets a promise for the progress bar's mode. */
  async getMode(): Promise<string|null> {
    return (await this.host()).getAttribute('mode');
  }
}