def test_from_iterable_backpressure():
it = iter(range(5))
source = Source.from_iterable(it)
L = source.rate_limit(0.1).sink_to_list()
source.start()
wait_for(lambda: L == [0], 1, period=0.01)
assert next(it) == 2 # 1 is in blocked _emit
def test_from_iterable_stop():
from _pytest.outcomes import Failed
source = Source.from_iterable(range(5))
L = source.rate_limit(0.01).sink_to_list()
source.start()
wait_for(lambda: L == [0], 1)
source.stop()
assert source.stopped
with pytest.raises(Failed):
wait_for(lambda: L == [0, 1, 2], 0.1)
def test_from_iterable():
source = Source.from_iterable(range(3))
L = source.sink_to_list()
source.start()
wait_for(lambda: L == [0, 1, 2], 0.1)