t.Errorf("Expected exactly one invocation, got %d", invocations)
	}
	used := atomic.LoadInt32(&fp.used)
	if used != 1 {
		t.Errorf("Expected exactly one tick, got %d", used)
	}
}

func TestPollError(t *testing.T) {
	expectedError := errors.New("Expected error")
	f := ConditionFunc(func() (bool, error) {
		return false, expectedError
	})
	fp := fakePoller{max: 1}