def test_connect_discombine_latest():
a = Stream()
b = Stream()
c = Stream()
x = a.combine_latest(b, c, emit_on=a)
L = x.sink_to_list()
c.disconnect(x)
b.emit(1)
c.emit(1)
a.emit(1)
assert L == [(1, 1)]
def test_disconnect_zip():
a = Stream()
b = Stream()
c = Stream()
x = a.zip(b, c)
L = x.sink_to_list()
b.disconnect(x)
a.emit(1)
b.emit(1)
assert not L
c.emit(1)
assert L == [(1, 1)]
def test_disconnect():
source = Stream()
upstream = Stream()
L = upstream.sink_to_list()
source.emit(1)
assert L == []
source.connect(upstream)
source.emit(2)
source.emit(3)
assert L == [2, 3]
source.disconnect(upstream)
source.emit(4)
assert L == [2, 3]
