def test_client_destroy_listener():
global a, b
s1, s2 = socket.socketpair(socket.AF_UNIX, socket.SOCK_STREAM, 0)
a = 0
b = 0
display = Display()
client = Client(display, s1.fileno())
destroy_listener_a = DestroyListener(destroy_notify_a)
destroy_listener_b = DestroyListener(destroy_notify_b)
client.add_destroy_listener(destroy_listener_a)
client.add_destroy_listener(destroy_listener_b)
destroy_listener_a.remove()
client.destroy()
assert a == 0
assert b == 1
display.destroy()
