refactor: move angular source to /packages rather than modules/@angular
This commit is contained in:
Jason Aden
318
packages/core/test/fake_async_spec.ts
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318
packages/core/test/fake_async_spec.ts
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {discardPeriodicTasks, fakeAsync, flushMicrotasks, tick} from '@angular/core/testing';
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import {Log, beforeEach, describe, inject, it} from '@angular/core/testing/testing_internal';
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import {expect} from '@angular/platform-browser/testing/matchers';
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import {Parser} from '../../compiler/src/expression_parser/parser';
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const resolvedPromise = Promise.resolve(null);
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const ProxyZoneSpec: {assertPresent: () => void} = (Zone as any)['ProxyZoneSpec'];
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export function main() {
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describe('fake async', () => {
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it('should run synchronous code', () => {
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let ran = false;
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fakeAsync(() => { ran = true; })();
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expect(ran).toEqual(true);
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});
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it('should pass arguments to the wrapped function', () => {
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fakeAsync((foo: any /** TODO #9100 */, bar: any /** TODO #9100 */) => {
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expect(foo).toEqual('foo');
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expect(bar).toEqual('bar');
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})('foo', 'bar');
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});
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it('should work with inject()', fakeAsync(inject([Parser], (parser: any /** TODO #9100 */) => {
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expect(parser).toBeAnInstanceOf(Parser);
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})));
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it('should throw on nested calls', () => {
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expect(() => {
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fakeAsync(() => { fakeAsync((): any /** TODO #9100 */ => null)(); })();
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}).toThrowError('fakeAsync() calls can not be nested');
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});
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it('should flush microtasks before returning', () => {
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let thenRan = false;
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fakeAsync(() => { resolvedPromise.then(_ => { thenRan = true; }); })();
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expect(thenRan).toEqual(true);
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});
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it('should propagate the return value',
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() => { expect(fakeAsync(() => 'foo')()).toEqual('foo'); });
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describe('Promise', () => {
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it('should run asynchronous code', fakeAsync(() => {
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let thenRan = false;
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resolvedPromise.then((_) => { thenRan = true; });
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expect(thenRan).toEqual(false);
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flushMicrotasks();
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expect(thenRan).toEqual(true);
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}));
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it('should run chained thens', fakeAsync(() => {
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const log = new Log();
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resolvedPromise.then((_) => log.add(1)).then((_) => log.add(2));
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expect(log.result()).toEqual('');
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flushMicrotasks();
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expect(log.result()).toEqual('1; 2');
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}));
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it('should run Promise created in Promise', fakeAsync(() => {
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const log = new Log();
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resolvedPromise.then((_) => {
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log.add(1);
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resolvedPromise.then((_) => log.add(2));
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});
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expect(log.result()).toEqual('');
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flushMicrotasks();
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expect(log.result()).toEqual('1; 2');
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}));
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it('should complain if the test throws an exception during async calls', () => {
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expect(() => {
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fakeAsync(() => {
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resolvedPromise.then((_) => { throw new Error('async'); });
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flushMicrotasks();
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})();
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}).toThrowError(/Uncaught \(in promise\): Error: async/);
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});
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it('should complain if a test throws an exception', () => {
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expect(() => { fakeAsync(() => { throw new Error('sync'); })(); }).toThrowError('sync');
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});
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});
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describe('timers', () => {
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it('should run queued zero duration timer on zero tick', fakeAsync(() => {
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let ran = false;
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setTimeout(() => { ran = true; }, 0);
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expect(ran).toEqual(false);
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tick();
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expect(ran).toEqual(true);
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}));
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it('should run queued timer after sufficient clock ticks', fakeAsync(() => {
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let ran = false;
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setTimeout(() => { ran = true; }, 10);
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tick(6);
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expect(ran).toEqual(false);
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tick(6);
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expect(ran).toEqual(true);
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}));
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it('should run queued timer only once', fakeAsync(() => {
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let cycles = 0;
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setTimeout(() => { cycles++; }, 10);
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tick(10);
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expect(cycles).toEqual(1);
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tick(10);
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expect(cycles).toEqual(1);
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tick(10);
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expect(cycles).toEqual(1);
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}));
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it('should not run cancelled timer', fakeAsync(() => {
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let ran = false;
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const id = setTimeout(() => { ran = true; }, 10);
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clearTimeout(id);
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tick(10);
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expect(ran).toEqual(false);
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}));
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it('should throw an error on dangling timers', () => {
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expect(() => {
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fakeAsync(() => { setTimeout(() => {}, 10); })();
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}).toThrowError('1 timer(s) still in the queue.');
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});
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it('should throw an error on dangling periodic timers', () => {
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expect(() => {
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fakeAsync(() => { setInterval(() => {}, 10); })();
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}).toThrowError('1 periodic timer(s) still in the queue.');
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});
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it('should run periodic timers', fakeAsync(() => {
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let cycles = 0;
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const id = setInterval(() => { cycles++; }, 10);
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tick(10);
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expect(cycles).toEqual(1);
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tick(10);
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expect(cycles).toEqual(2);
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tick(10);
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expect(cycles).toEqual(3);
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clearInterval(id);
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}));
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it('should not run cancelled periodic timer', fakeAsync(() => {
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let ran = false;
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const id = setInterval(() => { ran = true; }, 10);
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clearInterval(id);
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tick(10);
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expect(ran).toEqual(false);
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}));
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it('should be able to cancel periodic timers from a callback', fakeAsync(() => {
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let cycles = 0;
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let id: any /** TODO #9100 */;
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id = setInterval(() => {
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cycles++;
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clearInterval(id);
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}, 10);
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tick(10);
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expect(cycles).toEqual(1);
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tick(10);
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expect(cycles).toEqual(1);
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}));
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it('should clear periodic timers', fakeAsync(() => {
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let cycles = 0;
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const id = setInterval(() => { cycles++; }, 10);
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tick(10);
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expect(cycles).toEqual(1);
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discardPeriodicTasks();
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// Tick once to clear out the timer which already started.
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tick(10);
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expect(cycles).toEqual(2);
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tick(10);
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// Nothing should change
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expect(cycles).toEqual(2);
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}));
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it('should process microtasks before timers', fakeAsync(() => {
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const log = new Log();
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resolvedPromise.then((_) => log.add('microtask'));
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setTimeout(() => log.add('timer'), 9);
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const id = setInterval(() => log.add('periodic timer'), 10);
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expect(log.result()).toEqual('');
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tick(10);
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expect(log.result()).toEqual('microtask; timer; periodic timer');
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clearInterval(id);
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}));
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it('should process micro-tasks created in timers before next timers', fakeAsync(() => {
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const log = new Log();
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resolvedPromise.then((_) => log.add('microtask'));
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setTimeout(() => {
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log.add('timer');
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resolvedPromise.then((_) => log.add('t microtask'));
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}, 9);
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const id = setInterval(() => {
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log.add('periodic timer');
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resolvedPromise.then((_) => log.add('pt microtask'));
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}, 10);
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tick(10);
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expect(log.result())
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.toEqual('microtask; timer; t microtask; periodic timer; pt microtask');
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tick(10);
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expect(log.result())
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.toEqual(
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'microtask; timer; t microtask; periodic timer; pt microtask; periodic timer; pt microtask');
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clearInterval(id);
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}));
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});
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describe('outside of the fakeAsync zone', () => {
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it('calling flushMicrotasks should throw', () => {
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expect(() => {
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flushMicrotasks();
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}).toThrowError('The code should be running in the fakeAsync zone to call this function');
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});
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it('calling tick should throw', () => {
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expect(() => {
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tick();
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}).toThrowError('The code should be running in the fakeAsync zone to call this function');
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});
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it('calling discardPeriodicTasks should throw', () => {
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expect(() => {
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discardPeriodicTasks();
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}).toThrowError('The code should be running in the fakeAsync zone to call this function');
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});
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});
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describe('only one `fakeAsync` zone per test', () => {
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let zoneInBeforeEach: Zone;
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let zoneInTest1: Zone;
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beforeEach(fakeAsync(() => { zoneInBeforeEach = Zone.current; }));
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it('should use the same zone as in beforeEach', fakeAsync(() => {
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zoneInTest1 = Zone.current;
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expect(zoneInTest1).toBe(zoneInBeforeEach);
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}));
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});
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});
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describe('ProxyZone', () => {
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beforeEach(() => { ProxyZoneSpec.assertPresent(); });
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afterEach(() => { ProxyZoneSpec.assertPresent(); });
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it('should allow fakeAsync zone to retroactively set a zoneSpec outside of fakeAsync', () => {
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ProxyZoneSpec.assertPresent();
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let state: string = 'not run';
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const testZone = Zone.current.fork({name: 'test-zone'});
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(fakeAsync(() => {
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testZone.run(() => {
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Promise.resolve('works').then((v) => state = v);
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expect(state).toEqual('not run');
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flushMicrotasks();
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expect(state).toEqual('works');
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});
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}))();
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expect(state).toEqual('works');
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});
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});
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}
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