angular-cn/modules/@angular/examples/testing/ts/fake_async.ts

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881 B
TypeScript

import {clearPendingTimers, describe, expect, fakeAsync, it, tick} from '@angular/core/testing';
// #docregion basic
describe('this test', () => {
it('looks async but is synchronous', <any>fakeAsync((): void => {
var flag = false;
setTimeout(() => { flag = true; }, 100);
expect(flag).toBe(false);
tick(50);
expect(flag).toBe(false);
tick(50);
expect(flag).toBe(true);
}));
});
// #enddocregion
// #docregion pending
describe('this test', () => {
it('aborts a timer', <any>fakeAsync((): void => {
// This timer is scheduled but doesn't need to complete for the
// test to pass (maybe it's a timeout for some operation).
// Leaving it will cause the test to fail...
setTimeout(() => {}, 100);
// Unless we clean it up first.
clearPendingTimers();
}));
});
// #enddocregion