def test_transportInterfaces(self):
"""
The transport wrapper passed to the wrapped protocol's
C{makeConnection} provides the same interfaces as are provided by the
original transport.
"""
class IStubTransport(Interface):
pass
@implementer(IStubTransport)
class StubTransport:
pass
# Looking up what ProtocolWrapper implements also mutates the class.
# It adds __implemented__ and __providedBy__ attributes to it. These
# prevent __getattr__ from causing the IStubTransport.providedBy call
# below from returning True. If, by accident, nothing else causes
# these attributes to be added to ProtocolWrapper, the test will pass,
# but the interface will only be provided until something does trigger
# their addition. So we just trigger it right now to be sure.
implementedBy(policies.ProtocolWrapper)
proto = protocol.Protocol()
wrapper = policies.ProtocolWrapper(policies.WrappingFactory(None), proto)
wrapper.makeConnection(StubTransport())
self.assertTrue(IStubTransport.providedBy(proto.transport))
def _getWrapper(self):
"""
Return L{policies.ProtocolWrapper} that has been connected to a
L{StringTransport}.
"""
wrapper = policies.ProtocolWrapper(policies.WrappingFactory(Server()),
protocol.Protocol())
transport = StringTransport()
wrapper.makeConnection(transport)
return wrapper
def test_breakReferenceCycle(self):
"""
L{policies.ProtocolWrapper.connectionLost} sets C{wrappedProtocol} to
C{None} in order to break reference cycle between wrapper and wrapped
protocols.
:return:
"""
wrapper = policies.ProtocolWrapper(policies.WrappingFactory(Server()),
protocol.Protocol())
transport = StringTransportWithDisconnection()
transport.protocol = wrapper
wrapper.makeConnection(transport)
self.assertIsNotNone(wrapper.wrappedProtocol)
transport.loseConnection()
self.assertIsNone(wrapper.wrappedProtocol)
