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from blinker import Signal
def test_temp_connection():
sig = Signal()
canary = []
def receiver(sender):
canary.append(sender)
sig.send(1)
with sig.connected_to(receiver):
sig.send(2)
sig.send(3)
assert canary == [2]
assert not sig.receivers
def test_temp_connection_for_sender():
sig = Signal()
canary = []
def receiver(sender):
canary.append(sender)
with sig.connected_to(receiver, sender=2):
sig.send(1)
sig.send(2)
assert canary == [2]
assert not sig.receivers
def test_temp_connection_failure():
sig = Signal()
canary = []
def receiver(sender):
canary.append(sender)
class Failure(Exception):
pass
try:
sig.send(1)
with sig.connected_to(receiver):
sig.send(2)
raise Failure
sig.send(3)
except Failure:
pass
else:
raise AssertionError("Context manager did not propagate.")
assert canary == [2]
assert not sig.receivers
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