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Where is MockNgZone for Angular 4

Angular 2 provided a mock implementation of NgZone called MockNgZone. This doesn't appear to be available in Angular 4. Does anyone know where or why it has gone?

@angular/core/testing

import MockNgZone from "@angular/core/testing"

core/testing: Remove the following APIs from @angular/core/testing, which have been deprecated or were never intended to be publicly exported:

1 Answer
1

Overview: Angular 4/5/6 still define MockNgZone within @angular/core/testing/src/ng_zone_mock, however it is not exported publicly. Created December 2017, Issue #21075: Expose MockNgZone is still open on Angular's GitHub account. Pull Request #21628 was started January 2018 and exposes MockNgZone but the PR has never been completed, stalled with a merge conflict since March 2018.

MockNgZone

Option 1: Re-create MockNgZone as a testing utility for yourself.

MockNgZone

import EventEmitter, Injectable, NgZone from '@angular/core';

@Injectable()
export class MockNgZone extends NgZone
onStable: EventEmitter<any> = new EventEmitter(false);
constructor() super(enableLongStackTrace: false);
run(fn: Function): any return fn();
runOutsideAngular(fn: Function): any return fn();
simulateZoneExit(): void this.onStable.emit(null);



Option 2: Angular does publicly export a similar NoopNgZone from the same location as NgZone however the implementation is different from MockNgZone.

NoopNgZone

NgZone

MockNgZone

import NgZone from '@angular/core';
import NoopNgZone from '@angular/core/src/zone/ng_zone';

TestBed.configureTestingModule(
providers: [ provide: NgZone, useClass: NoopNgZone ]
)


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