1// Copyright (C) 2023 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15import {defer} from './deferred'; 16import {DisposableStack} from './disposable_stack'; 17import {EvtSource} from './events'; 18 19describe('Events', () => { 20 test('voidEvent', () => { 21 const ev = new EvtSource<void>(); 22 const calls: string[] = []; 23 ev.addListener(() => calls.push('listener1')); 24 ev.addListener(() => calls.push('listener2')); 25 ev.notify(); 26 expect(calls).toEqual(['listener1', 'listener2']); 27 ev.notify(); 28 expect(calls).toEqual(['listener1', 'listener2', 'listener1', 'listener2']); 29 }); 30 31 test('eventWithArgs', () => { 32 const ev = new EvtSource<number>(); 33 const argsReceived = new Array<number>(); 34 ev.addListener((n: number) => argsReceived.push(n)); 35 ev.notify(1); 36 ev.notify(2); 37 expect(argsReceived).toEqual([1, 2]); 38 }); 39 40 test('asyncEvent', async () => { 41 const ev = new EvtSource<number>(); 42 const argsReceived = new Array<number>(); 43 ev.addListener((n: number) => { 44 const promise = defer<void>(); 45 setTimeout(() => { 46 argsReceived.push(n); 47 promise.resolve(); 48 }, 0); 49 return promise; 50 }); 51 await ev.notify(1); 52 await ev.notify(2); 53 await ev.notify(3); 54 expect(argsReceived).toEqual([1, 2, 3]); 55 }); 56 57 test('dispose', () => { 58 const ev = new EvtSource<void>(); 59 const calls: string[] = []; 60 const trash = new DisposableStack(); 61 trash.use(ev.addListener(() => calls.push('listener1'))); 62 trash.use(ev.addListener(() => calls.push('listener2'))); 63 ev.notify(); 64 expect(calls).toEqual(['listener1', 'listener2']); 65 calls.splice(0); 66 67 trash.dispose(); 68 ev.notify(); 69 expect(calls).toEqual([]); 70 71 trash.use(ev.addListener(() => calls.push('listener3'))); 72 ev.notify(); 73 expect(calls).toEqual(['listener3']); 74 }); 75}); 76