package worker

import "testing"

func TestCloseSubscribersClosesEveryAlertStream(t *testing.T) {
	scheduler := &TaskScheduler{subscribers: map[uint]map[chan []byte]struct{}{}}
	first := scheduler.Subscribe(1)
	second := scheduler.Subscribe(1)
	third := scheduler.Subscribe(2)

	scheduler.closeSubscribers()

	for _, ch := range []chan []byte{first, second, third} {
		if _, open := <-ch; open {
			t.Fatal("subscriber channel remains open after scheduler shutdown")
		}
	}
	if len(scheduler.subscribers) != 0 {
		t.Fatalf("subscriber registry was not cleared: %#v", scheduler.subscribers)
	}

	// Handlers defer Unsubscribe. It must remain safe after shutdown has already
	// closed and removed every channel.
	scheduler.Unsubscribe(1, first)
}