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
Parameters
fn
|
Function |
The function that you want to wrap in the |
Returns
(...args: any[]) => any: The function wrapped to be executed in the fakeAsync zone.
Any arguments passed when calling this returned function will be passed through to the fn
function in the parameters when it is called.
Description
If there are any pending timers at the end of the function, an exception is thrown.
Can be used to wrap inject() calls.
Further information is available in the Usage Notes...
Usage notes
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);
}));
});