upstream-rocketchat/apps/meteor/client/lib/utils/fireGlobalEventBase.spec.ts

import { fireGlobalEventBase } from './fireGlobalEventBase';

const postMessageMock = jest.fn();
const dispatchEventMock = jest.fn();

const originalDispatch = window.dispatchEvent;
const originalPostMessage = parent.postMessage;

beforeAll(() => {
	window.dispatchEvent = dispatchEventMock;
	parent.postMessage = postMessageMock;
});

beforeEach(() => {
	postMessageMock.mockClear();
	dispatchEventMock.mockClear();
});

afterAll(() => {
	window.dispatchEvent = originalDispatch;
	parent.postMessage = originalPostMessage;
});

it('should dispatch event but not post message', () => {
	const detail = 'test-detail';
	const postMessage = fireGlobalEventBase('test-event', detail);
	postMessage(false, '');

	expect(postMessageMock).not.toHaveBeenCalled();

	expect(dispatchEventMock).toHaveBeenCalledTimes(1);

	const result = dispatchEventMock.mock.lastCall[0];
	expect(result).toBeInstanceOf(CustomEvent);
	expect(result.detail).toBe(detail);
	expect(result.type).toBe('test-event');
});

it('should dispatch event and post message', () => {
	const detail = 'test-detail';
	const origin = 'test-origin';
	const postMessage = fireGlobalEventBase('test-event', detail);
	postMessage(true, origin);

	expect(postMessageMock).toHaveBeenCalledTimes(1);

	expect(dispatchEventMock).toHaveBeenCalledTimes(1);

	const dispatchResult = dispatchEventMock.mock.lastCall[0];
	expect(dispatchResult).toBeInstanceOf(CustomEvent);
	expect(dispatchResult.detail).toBe(detail);
	expect(dispatchResult.type).toBe('test-event');

	const [postEventResult, originResult] = postMessageMock.mock.lastCall;
	expect(postEventResult).toBeInstanceOf(Object);
	expect(originResult).toBe(origin);
	expect(postEventResult.data).toBe(detail);
	expect(postEventResult.eventName).toBe('test-event');
});