fakeAsync
Wraps a function to be executed in the fakeAsync zone:
- microtasks are manually executed by calling
flushMicrotasks(), - timers are synchronous,
tick()simulates the asynchronous passage of time.
fakeAsync(fn: Function): (...args: any[]) => any
参数
fn | Function |
返回值
(...args: any[]) => any: The function wrapped to be executed in the fakeAsync zone
说明
If there are any pending timers at the end of the function, an exception will be thrown.
Can be used to wrap inject() calls.
使用说明
Example
describe('this test', () => {
it('looks async but is synchronous', <any>fakeAsync((): void => {
let flag = false;
setTimeout(() => { flag = true; }, 100);
expect(flag).toBe(false);
tick(50);
expect(flag).toBe(false);
tick(50);
expect(flag).toBe(true);
}));
});
