angular__angular/packages/zone.js/test/rxjs/rxjs.Observable.distinct.spec.ts

/**
 * @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 {Observable, of} from 'rxjs';
import {distinct, distinctUntilChanged, distinctUntilKeyChanged} from 'rxjs/operators';

describe('Observable.distinct', () => {
  let log: any[];
  let observable1: Observable<any>;

  beforeEach(() => {
    log = [];
  });

  it('distinct func callback should run in the correct zone', () => {
    const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
    const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
    const error = new Error('test');
    observable1 = constructorZone1.run(() => {
      return of(1, 1, 2, 2, 2, 1, 2, 3, 4, 3, 2, 1).pipe(distinct());
    });

    subscriptionZone.run(() => {
      observable1.subscribe(
        (result: any) => {
          log.push(result);
          expect(Zone.current.name).toEqual(subscriptionZone.name);
        },
        (err: any) => {
          fail('should not call error');
        },
        () => {
          log.push('completed');
          expect(Zone.current.name).toEqual(subscriptionZone.name);
        },
      );
    });
    expect(log).toEqual([1, 2, 3, 4, 'completed']);
  });

  it('distinctUntilChanged func callback should run in the correct zone', () => {
    const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
    const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
    const error = new Error('test');
    observable1 = constructorZone1.run(() => {
      return of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4).pipe(distinctUntilChanged());
    });

    subscriptionZone.run(() => {
      observable1.subscribe(
        (result: any) => {
          log.push(result);
          expect(Zone.current.name).toEqual(subscriptionZone.name);
        },
        (err: any) => {
          fail('should not call error');
        },
        () => {
          log.push('completed');
          expect(Zone.current.name).toEqual(subscriptionZone.name);
        },
      );
    });
    expect(log).toEqual([1, 2, 1, 2, 3, 4, 'completed']);
  });

  it('distinctUntilKeyChanged func callback should run in the correct zone', () => {
    const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
    const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
    const error = new Error('test');
    observable1 = constructorZone1.run(() => {
      return of(
        {age: 4, name: 'Foo'},
        {age: 7, name: 'Bar'},
        {age: 5, name: 'Foo'},
        {age: 6, name: 'Foo'},
      ).pipe(distinctUntilKeyChanged('name'));
    });

    subscriptionZone.run(() => {
      observable1.subscribe(
        (result: any) => {
          log.push(result);
          expect(Zone.current.name).toEqual(subscriptionZone.name);
        },
        (err: any) => {
          fail('should not call error');
        },
        () => {
          log.push('completed');
          expect(Zone.current.name).toEqual(subscriptionZone.name);
        },
      );
    });
    expect(log).toEqual([
      {age: 4, name: 'Foo'},
      {age: 7, name: 'Bar'},
      {age: 5, name: 'Foo'},
      'completed',
    ]);
  });
});