Angular 2 RC5 Unit Testing - ComponentFixture detectChanges() not working

I'm running into a unit testing issue with Angular 2 RC5 where it doesn't appear that the ComponentFixture detectChanges method is working the way I expect it to. Here is a snippet of my code:

  describe('Component Test 1', () => {
    beforeEach(async(() => {
      TestBed.compileComponents();
    }));

    it('should calculate base price', async(() => {
      var fixture = TestBed.createComponent(CalcComponent);
      console.log('Got here 1.');
      fixture.detectChanges();
      console.log('Got here 2.');

      expect(fixture.componentInstance.calculateBasePrice()).toBeGreaterThan(50);
    }));
  });

Essentially, when this unit test is run, 'Got here 1.' is printed but the test never goes on to print the second 'Got here 2.' line, and I don't get any sort of useful error message regarding what the error might be. All I get is a very generic message telling me the test failed, even though it clearly never got to the expectation line seeing as how the second console.log line is never printed:

SUMMARY:
√ 9 tests completed
× 1 test failed

FAILED TESTS:
  CalcComponent Tests
    test1
      × should calculate base price
        PhantomJS 2.1.1 (Windows 7 0.0.0)
      detectChanges
      detectViewChildrenChanges
      detectChangesInternal
      detectChanges
      detectChanges
      detectViewChildrenChanges
      detectChangesInternal
      detectChanges
      detectChanges
      detectChanges
...

I know the problem is around the fixture.detectChanges() line because if I do comment it out, the second console.log prints, and I get an error regarding the expectation failing because of an undefined object (probably since fixture.detectChanges() was never called). Does anyone have an idea of what might be going on here?