Medplum

// SPDX-FileCopyrightText: Copyright Orangebot, Inc. and Medplum contributors // SPDX-License-Identifier: Apache-2.0 import { EventTarget, TypedEventTarget } from './eventtarget'; describe('EventTarget', () => { test('No listeners', () => { const target = new EventTarget(); expect(() => target.dispatchEvent({ type: 'test' })).not.toThrow(); }); test('Add event listener', () => { const myCallback = jest.fn(); const target = new EventTarget(); target.addEventListener('test', myCallback); target.dispatchEvent({ type: 'test' }); expect(myCallback).toHaveBeenCalled(); }); test('Add multiple event listeners', () => { const myCallback1 = jest.fn(); const myCallback2 = jest.fn(); const target = new EventTarget(); target.addEventListener('test', myCallback1); target.addEventListener('test', myCallback2); target.dispatchEvent({ type: 'test' }); expect(myCallback1).toHaveBeenCalled(); expect(myCallback2).toHaveBeenCalled(); }); test('Remove event listener', () => { const myCallback = jest.fn(); const target = new EventTarget(); target.addEventListener('test', myCallback); target.removeEventListener('test', myCallback); target.dispatchEvent({ type: 'test' }); expect(myCallback).not.toHaveBeenCalled(); }); test('Remove event listener not found', () => { const myCallback = jest.fn(); const target = new EventTarget(); target.removeEventListener('test', jest.fn()); target.addEventListener('test', myCallback); target.removeEventListener('test', jest.fn()); expect(() => target.dispatchEvent({ type: 'test' })).not.toThrow(); expect(myCallback).toHaveBeenCalled(); }); test('Remove all event listeners', () => { const target = new EventTarget(); const myCallback1 = jest.fn(); const myCallback2 = jest.fn(); const myCallback3 = jest.fn(); target.addEventListener('test1', myCallback1); target.addEventListener('test1', myCallback2); target.addEventListener('test2', myCallback3); target.removeAllListeners(); expect(() => target.dispatchEvent({ type: 'test1' })).not.toThrow(); expect(() => target.dispatchEvent({ type: 'test2' })).not.toThrow(); expect(myCallback1).not.toHaveBeenCalled(); expect(myCallback2).not.toHaveBeenCalled(); expect(myCallback3).not.toHaveBeenCalled(); }); test('Listener count', () => { const target = new EventTarget(); target.addEventListener('test1', jest.fn()); expect(target.listenerCount('test1')).toStrictEqual(1); expect(target.listenerCount('test2')).toStrictEqual(0); target.addEventListener('test1', jest.fn()); expect(target.listenerCount('test1')).toStrictEqual(2); target.removeAllListeners(); expect(target.listenerCount('test1')).toStrictEqual(0); expect(target.listenerCount('test2')).toStrictEqual(0); }); }); describe('TypedEventTarget', () => { test('Constructor', () => { expect(() => new TypedEventTarget()).not.toThrow(); }); test('Add event listener', () => { const myCallback = jest.fn(); const target = new TypedEventTarget<{ test: { type: 'test' } }>(); target.addEventListener('test', myCallback); target.dispatchEvent({ type: 'test' }); expect(myCallback).toHaveBeenCalled(); }); test('Add multiple event listeners', () => { const myCallback1 = jest.fn(); const myCallback2 = jest.fn(); const target = new TypedEventTarget<{ test: { type: 'test' } }>(); target.addEventListener('test', myCallback1); target.addEventListener('test', myCallback2); target.dispatchEvent({ type: 'test' }); expect(myCallback1).toHaveBeenCalled(); expect(myCallback2).toHaveBeenCalled(); }); test('Remove event listener', () => { const myCallback = jest.fn(); const target = new TypedEventTarget<{ test: { type: 'test' } }>(); target.addEventListener('test', myCallback); target.removeEventListener('test', myCallback); target.dispatchEvent({ type: 'test' }); expect(myCallback).not.toHaveBeenCalled(); }); test('Remove event listener not found', () => { const myCallback = jest.fn(); const target = new TypedEventTarget<{ test: { type: 'test' } }>(); target.removeEventListener('test', jest.fn()); target.addEventListener('test', myCallback); target.removeEventListener('test', jest.fn()); expect(() => target.dispatchEvent({ type: 'test' })).not.toThrow(); expect(myCallback).toHaveBeenCalled(); }); test('Remove all event listeners', () => { const target = new TypedEventTarget<{ test1: { type: 'test1' }; test2: { type: 'test2' } }>(); const myCallback1 = jest.fn(); const myCallback2 = jest.fn(); const myCallback3 = jest.fn(); target.addEventListener('test1', myCallback1); target.addEventListener('test1', myCallback2); target.addEventListener('test2', myCallback3); target.removeAllListeners(); expect(() => target.dispatchEvent({ type: 'test1' })).not.toThrow(); expect(() => target.dispatchEvent({ type: 'test2' })).not.toThrow(); expect(myCallback1).not.toHaveBeenCalled(); expect(myCallback2).not.toHaveBeenCalled(); expect(myCallback3).not.toHaveBeenCalled(); }); test('Listener count', () => { const target = new TypedEventTarget<{ test1: { type: 'test1' }; test2: { type: 'test2' } }>(); target.addEventListener('test1', jest.fn()); expect(target.listenerCount('test1')).toStrictEqual(1); expect(target.listenerCount('test2')).toStrictEqual(0); target.addEventListener('test1', jest.fn()); expect(target.listenerCount('test1')).toStrictEqual(2); target.removeAllListeners(); expect(target.listenerCount('test1')).toStrictEqual(0); expect(target.listenerCount('test2')).toStrictEqual(0); }); });