react-native-navigation/lib/module/events/CommandsObserver.test.js

React Native Navigation - truly native navigation for iOS and Android

"use strict";

import { CommandsObserver } from "./CommandsObserver.js";
import { UniqueIdProvider } from "../adapters/UniqueIdProvider.js";
describe('CommandsObserver', () => {
  let uut;
  let cb1;
  let cb2;
  beforeEach(() => {
    cb1 = jest.fn();
    cb2 = jest.fn();
    uut = new CommandsObserver(new UniqueIdProvider());
  });
  it('register and notify listener', () => {
    const theCommandName = 'theCommandName';
    const theParams = {
      x: 1
    };
    uut.register(cb1);
    uut.register(cb2);
    expect(cb1).toHaveBeenCalledTimes(0);
    expect(cb2).toHaveBeenCalledTimes(0);
    uut.notify(theCommandName, theParams);
    expect(cb1).toHaveBeenCalledTimes(1);
    expect(cb1).toHaveBeenCalledWith(theCommandName, theParams);
    expect(cb2).toHaveBeenCalledTimes(1);
    expect(cb2).toHaveBeenCalledWith(theCommandName, theParams);
  });
  it('remove listener', () => {
    expect(cb1).toHaveBeenCalledTimes(0);
    expect(cb2).toHaveBeenCalledTimes(0);
    uut.register(cb1);
    const cb2Subscription = uut.register(cb2);
    uut.notify('commandName', {});
    expect(cb1).toHaveBeenCalledTimes(1);
    expect(cb2).toHaveBeenCalledTimes(1);
    cb2Subscription.remove();
    uut.notify('commandName', {});
    expect(cb1).toHaveBeenCalledTimes(2);
    expect(cb2).toHaveBeenCalledTimes(1);
  });
});
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