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import test_callbacks_ext as t
import gc
def test_callbacks():
pub1 = t.publisher()
pub2 = t.publisher()
record = []
def sub1(x):
record.append(x + 10)
def sub2(x):
record.append(x + 20)
pub1.subscribe(sub1)
pub2.subscribe(sub2)
for pub in (pub1, pub2):
pub.subscribe(record.append)
pub1.emit(1)
assert record == [11, 1]
del record[:]
pub2.emit(2)
assert record == [22, 2]
del record[:]
pub1_w, pub2_w = t.registry.keys() # weakrefs to pub1, pub2
assert pub1_w() is pub1
assert pub2_w() is pub2
assert t.registry[pub1_w].subscribers == {sub1, record.append}
assert t.registry[pub2_w].subscribers == {sub2, record.append}
# NB: this `record.append` is a different object than the one we subscribed
# above, so we're testing the normalization logic in unsubscribe_policy
pub1.unsubscribe(record.append)
assert t.registry[pub1_w].subscribers == {sub1}
pub1.emit(3)
assert record == [13]
del record[:]
del pub, pub1
gc.collect()
gc.collect()
assert pub1_w() is None
assert pub2_w() is pub2
assert t.registry.keys() == {pub2_w}
pub2.emit(4)
assert record == [24, 4]
del record[:]
del pub2
gc.collect()
gc.collect()
assert pub2_w() is None
assert not t.registry
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