Class SpyLocation

packages/common/testing/src/location_mock.ts:24–209

 */
@Injectable()
export class SpyLocation implements Location {
  urlChanges: string[] = [];
  private _history: LocationState[] = [new LocationState('', '', null)];
  private _historyIndex: number = 0;
  /** @internal */
  _subject = new Subject<PopStateEvent>();
  /** @internal */
  _basePath: string = '';
  /** @internal */
  _locationStrategy: LocationStrategy = null!;
  /** @internal */
  _urlChangeListeners: ((url: string, state: unknown) => void)[] = [];
  /** @internal */
  _urlChangeSubscription: SubscriptionLike | null = null;

  /** @docs-private */
  ngOnDestroy(): void {
    this._urlChangeSubscription?.unsubscribe();
    this._urlChangeListeners = [];
  }

  setInitialPath(url: string) {
    this._history[this._historyIndex].path = url;
  }

  setBaseHref(url: string) {
    this._basePath = url;
  }

  path(): string {
    return this._history[this._historyIndex].path;
  }

  getState(): unknown {
    return this._history[this._historyIndex].state;
  }

  isCurrentPathEqualTo(path: string, query: string = ''): boolean {
    const givenPath = path.endsWith('/') ? path.substring(0, path.length - 1) : path;
    const currPath = this.path().endsWith('/')
      ? this.path().substring(0, this.path().length - 1)
      : this.path();

    return currPath == givenPath + (query.length > 0 ? '?' + query : '');
  }

  simulateUrlPop(pathname: string) {
    this._subject.next({'url': pathname, 'pop': true, 'type': 'popstate'});
  }

  simulateHashChange(pathname: string) {
    const path = this.prepareExternalUrl(pathname);
    this.pushHistory(path, '', null);

    this.urlChanges.push('hash: ' + pathname);
    // the browser will automatically fire popstate event before each `hashchange` event, so we need
    // to simulate it.
    this._subject.next({'url': pathname, 'pop': true, 'type': 'popstate'});