Running Angular2 tests that call setTimeout errors with "Cannot use setInterval from within an async zone test"

I'm upgrading our Angular2 app to use rc4 and I started getting an error on my unit tests:

Cannot use setInterval from within an async zone test

My widget makes a request for data from its ngOnInit method and puts up a loading indicator while that request is made. My mocked service returns some data after 1ms.

Here's a simplified version that exposes the problem

import { inject, async, TestComponentBuilder, ComponentFixture} from '@angular/core/testing';
import {Http, Headers, RequestOptions, Response, HTTP_PROVIDERS} from '@angular/http';
import {provide, Component} from '@angular/core';

import {Observable} from "rxjs/Rx";

class MyService {
    constructor(private _http: Http) {}
    getData() {
        return this._http.get('/some/rule').map(resp => resp.text());
    }
}

@Component({
    template: `<div>
      <div class="loader" *ngIf="_isLoading">Loading</div>
      <div class="data" *ngIf="_data"></div>
    </div>`
})
class FakeComponent {
    private _isLoading: boolean = false;
    private _data: string = '';

    constructor(private _service: MyService) {}

    ngOnInit() {
        this._isLoading = true;
        this._service.getData().subscribe(data => {
            this._isLoading = false;
            this._data = data;
        });
    }
}

describe('FakeComponent', () => {
    var service = new MyService(null);
    var _fixture:ComponentFixture<FakeComponent>;

    beforeEach(async(inject([TestComponentBuilder], (tcb:TestComponentBuilder) => {
        return tcb
            .overrideProviders(FakeComponent, [
                HTTP_PROVIDERS,
                provide(MyService, {useValue: service}),
            ])
            .createAsync(FakeComponent)
            .then((fixture:ComponentFixture<FakeComponent>) => {
                _fixture = fixture;
            });
    })));

    it('Shows loading while fetching data', (cb) => {
        // Make the call to getData take one ms so we can verify its state while the request is pending
        spyOn(service, 'getData').and.returnValue(Observable.of('value').delay(1));

        _fixture.detectChanges();
        expect(_fixture.nativeElement.querySelector('.loader')).toBeTruthy();
        // Wait a few ms, should not be loading
        setTimeout(() => {
            _fixture.detectChanges();
            expect(_fixture.nativeElement.querySelector('.loader')).toBeFalsy();
            cb();
        }, 10);
    });
});

This was working fine in Angular2 rc1 and it throws an error in rc4, any suggestions?