public void GivenAConnectedUserWithManyConnections_ThenTheJoinedAtDatetimeShouldBeTheTimestampOfTheFirstConnection()
{
var chat = new ChatRoom();
chat.Connect("username", Now.AddMinutes(-2), DummyConnectionId());
chat.Connect("username", Now.AddMinutes(-1), DummyConnectionId());
chat.Connect("username", Now, DummyConnectionId());
chat.ConnectedUserByUsername("username").Value
.JoinedAt.Should().Be(Now.AddMinutes(-2));
}