@yoroi/common/lib/module/observer/observer.test.js

The Common package of Yoroi SDK

import { observerMaker } from './observer';
describe('Observer', () => {
  let observer;
  let mockSubscriber1;
  let mockSubscriber2;
  beforeEach(() => {
    observer = observerMaker();
    mockSubscriber1 = jest.fn();
    mockSubscriber2 = jest.fn();
  });
  it('should allow subscribers to subscribe', () => {
    observer.subscribe(mockSubscriber1);
    observer.notify(42);
    expect(mockSubscriber1).toHaveBeenCalledWith(42);
  });
  it('should allow multiple subscribers to subscribe', () => {
    const client1 = observer.subscribe(mockSubscriber1);
    const client2 = observer.subscribe(mockSubscriber2);
    observer.notify(42);
    expect(mockSubscriber1).toHaveBeenCalledWith(42);
    expect(mockSubscriber2).toHaveBeenCalledWith(42);
    client1.unsubscribe();
    client2.unsubscribe();
  });
  it('should allow subscribers to unsubscribe', () => {
    const client1 = observer.subscribe(mockSubscriber1);
    client1.unsubscribe();
    observer.notify(42);
    expect(mockSubscriber1).not.toHaveBeenCalled();
  });
  it('should allow destroying all subscriptions', () => {
    const client1 = observer.subscribe(mockSubscriber1);
    observer.subscribe(mockSubscriber2);
    observer.unsubscribe(client1);
    observer.notify(42);
    expect(mockSubscriber2).toHaveBeenCalledWith(42);
    expect(mockSubscriber1).not.toHaveBeenCalled();
    observer.destroy();
    observer.notify(42);
    expect(mockSubscriber1).not.toHaveBeenCalled();
    expect(mockSubscriber2).toHaveBeenCalledTimes(1);
  });
});
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