public async Task LearnerLearnsOfResult()
{
string result;
var learner = new Learner(3);
Assert.IsFalse(learner.TryGetResult("round", out result));
learner.SendMessage("", "AcceptorA", NetworkMessage.Commit("round", new SequenceNumber("[1:ProposerA]"), "foo").Accept());
learner.SendMessage("", "AcceptorA", NetworkMessage.Commit("round", new SequenceNumber("[1:ProposerA]"), "foo").Accept());
learner.SendMessage("", "AcceptorA", NetworkMessage.Commit("round", new SequenceNumber("[1:ProposerA]"), "foo").Accept());
Assert.IsFalse(learner.TryGetResult("round", out result));
learner.SendMessage("", "AcceptorB", NetworkMessage.Commit("round", new SequenceNumber("[2:ProposerB]"), "bar").Accept());
learner.SendMessage("", "AcceptorC", NetworkMessage.Commit("round", new SequenceNumber("[2:ProposerB]"), "bar").Accept());
Assert.AreEqual("bar", await learner.GetResult("round"));
Assert.IsTrue(learner.TryGetResult("round", out result));
Assert.AreEqual("bar", result);
}