Robolectric unit test for choreographer postFrameCallback

I have a method along the lines of

volatile boolean mIsDoingStuff = false; 

void doStuff() {
    Choreographer.getInstance().postFrameCallback(this);
    mIsDoingStuff = true;     
}

@Override
public void doFrame(long frameTimeNanos) {
    ...
    ...
    Choreographer.getInstance().postFrameCallback(this);
}

Now, I want to write a test along the lines of

@Test
public void testDoingStuff() {
    object.doStuff()
    assertThat(object.isDoingStuff()).isTrue();
}

This never works in the test because the postFrameCallback executes sequentially calling doFrame() over and over again, never hitting mIsDoingStuff = true. After the doFrame() calls end is when mIsDoingStuff gets set to true.

I'd like to test this so that I can call doStuff(), verify mIsDoingStuff = true, then call stopDoingStuff() and verify that mIsDoingStuff = false, which means I'd like to verify values when all the postFrameCallbacks are executing. How do I do this?