public void RemoveOneItemNotPresent()
{
MessageBus bus = new MessageBus();
List <string> output = new List <string>();
Action <OutputMessage> subscriber = m => output.Add(m.Text);
bus.Subscribe(subscriber);
TestRoom room = new TestRoom(bus);
Item removed = room.Remove("key");
room.Enter();
output.Should().Equal(
"You are in a test room.");
removed.Should().BeNull();
}