def test_node_receives_higher_proposals(self):
self.assertEqual(self.state.read(Node.PROPOSED), Proposal(None, 0))
self.role.receive(Prepare.create(proposal=Proposal('A', 1)), self.channel)
self.assertEqual(self.state.read(Node.PROPOSED), Proposal('A', 2))
self.role.receive(Promise.create(proposal=Proposal('A', 3)), self.channel)
self.assertEqual(self.state.read(Node.PROPOSED), Proposal('A', 4))
self.role.receive(Accept.create(proposal=Proposal('A', 5)), self.channel)
self.assertEqual(self.state.read(Node.PROPOSED), Proposal('A', 6))
self.role.receive(Accepted.create(proposal=Proposal('A', 7)), self.channel)
self.assertEqual(self.state.read(Node.PROPOSED), Proposal('A', 8))
def test_acceptor_receives_prepare_and_then_receives_lower_accept(self):
self.role.receive(Prepare.create(proposal=Proposal('A', 1)), self.channel)
self.role.receive(Accept.create(proposal=Proposal('A', 0)), self.channel)
self.assertTrue(type(self.channel.unicast_messages[-1]) is Nack)
