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from __future__ import annotations
import typing as t
import pytest
from blinker import Signal
def test_temp_connection() -> None:
sig = Signal()
canary = []
def receiver(sender: t.Any) -> None:
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() -> None:
sig = Signal()
canary = []
def receiver(sender: t.Any) -> None:
canary.append(sender)
with sig.connected_to(receiver, sender=2):
sig.send(1)
sig.send(2)
assert canary == [2]
assert not sig.receivers
class Failure(Exception):
pass
class BaseFailure(BaseException):
pass
@pytest.mark.parametrize("exc_type", [Failure, BaseFailure])
def test_temp_connection_failure(exc_type: type[BaseException]) -> None:
sig = Signal()
canary = []
def receiver(sender: t.Any) -> None:
canary.append(sender)
with pytest.raises(exc_type):
sig.send(1)
with sig.connected_to(receiver):
sig.send(2)
raise exc_type
sig.send(3)
assert canary == [2]
assert not sig.receivers
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