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import unittest
from unittest.mock import patch
from zope.interface import implementer
from twisted.internet.interfaces import IReactorTime
[docs]@implementer(IReactorTime)
class FakeReactor(object):
"""
This just fakes out enough reactor methods so .run() can work.
"""
stop_called = False
def __init__(self, to_raise):
self.stop_called = False
self.to_raise = to_raise
self.delayed = []
[docs] def run(self, *args, **kw):
raise self.to_raise
[docs] def stop(self):
self.stop_called = True
[docs] def callLater(self, delay, func, *args, **kwargs):
self.delayed.append((delay, func, args, kwargs))
[docs] def connectTCP(self, *args, **kw):
raise RuntimeError("ConnectTCP shouldn't get called")
[docs]class TestWampTwistedRunner(unittest.TestCase):
# XXX should figure out *why* but the test_protocol timeout
# tests fail if we *don't* patch out this txaio stuff. So,
# presumably it's messing up some global state that both tests
# implicitly depend on ...
[docs] @patch('txaio.use_twisted')
@patch('txaio.start_logging')
@patch('txaio.config')
def test_connect_error(self, *args):
"""
Ensure the runner doesn't swallow errors and that it exits the
reactor properly if there is one.
"""
try:
from autobahn.twisted.wamp import ApplicationRunner
from twisted.internet.error import ConnectionRefusedError
# the 'reactor' member doesn't exist until we import it
from twisted.internet import reactor # noqa: F401
except ImportError:
raise unittest.SkipTest('No twisted')
runner = ApplicationRunner('ws://localhost:1', 'realm')
exception = ConnectionRefusedError("It's a trap!")
with patch('twisted.internet.reactor', FakeReactor(exception)) as mockreactor:
self.assertRaises(
ConnectionRefusedError,
# pass a no-op session-creation method
runner.run, lambda _: None, start_reactor=True
)
self.assertTrue(mockreactor.stop_called)