time.Sleep(100 * time.Millisecond)
	ps.Lock()
	if len(ps.subs) != 1 {
		t.Fatal("expected 1 subscriber")
	}
	ps.Unlock()
	close(doneCh2)
}

type maskString string

func (m maskString) Mask() uint64 {
	return 1
}

func TestPubSub(t *testing.T) {
	ps := New[Maskable, Maskable](1)
	ch1 := make(chan Maskable, 1)
	doneCh1 := make(chan struct{})
	defer close(doneCh1)