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# -*- coding: utf-8 -*-
from mock import Mock
from twisted.internet.defer import inlineCallbacks
from twisted.python.failure import Failure
from pyee import TwistedEventEmitter
class PyeeTestError(Exception):
pass
def test_propagates_failure():
"""Test that TwistedEventEmitters can propagate failures
from twisted Deferreds
"""
ee = TwistedEventEmitter()
should_call = Mock()
@ee.on("event")
@inlineCallbacks
def event_handler():
yield Failure(PyeeTestError())
@ee.on("failure")
def handle_failure(f):
assert isinstance(f, Failure)
should_call(f)
ee.emit("event")
should_call.assert_called_once()
def test_propagates_sync_failure():
"""Test that TwistedEventEmitters can propagate failures
from twisted Deferreds
"""
ee = TwistedEventEmitter()
should_call = Mock()
@ee.on("event")
def event_handler():
raise PyeeTestError()
@ee.on("failure")
def handle_failure(f):
assert isinstance(f, Failure)
should_call(f)
ee.emit("event")
should_call.assert_called_once()
def test_propagates_exception():
"""Test that TwistedEventEmitters propagate failures as exceptions to
the error event when no failure handler
"""
ee = TwistedEventEmitter()
should_call = Mock()
@ee.on("event")
@inlineCallbacks
def event_handler():
yield Failure(PyeeTestError())
@ee.on("error")
def handle_error(exc):
assert isinstance(exc, Exception)
should_call(exc)
ee.emit("event")
should_call.assert_called_once()
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