public void AppliesEmpireSystemLoss() { var starSystem = new StarSystem { Id = ObjectId.GenerateNewId() }; var empire = new Empire { Id = ObjectId.GenerateNewId(), StarSystemsIds = new ObjectId[0] }; _simulationView.Empires = new Empire[] { empire }; _simulationView.StarSystems = new StarSystem[] { starSystem }; _deltaSet.DeltaObjectIds = new Delta <ObjectId>[] { new Delta <ObjectId> { DeltaType = DeltaType.EmpireSystemLoss, ReferenceId = empire.Id, Value = starSystem.Id } }; var result = _deltaApplier.GetForTick(It.IsAny <ObjectId>(), It.IsAny <int>()); var resultEmpire = Assert.Single(result.Empires); var resultSystemId = Assert.Single(resultEmpire.StarSystemsIds); Assert.Equal(starSystem.Id, resultSystemId); }