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Tests for implementations of L{IReactorUDP} and L{IReactorMulticast}.
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Raised by BadClient at the end of every datagramReceived call to try and
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A DatagramProtocol which always raises an exception from datagramReceived.
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Test that after loopback mode has been set, multicast packets are
delivered to their sender.
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Test that an attempt to join an address which is not a multicast
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Test that a multicast group can be joined and messages sent to and
received from it.
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