public async Task UniqueIndexActorAdd_ExpectsNewStateWithNewItems() { var stateManager = new Mock <IActorStateManager>(); var state1 = new Dictionary <string, string> { { "Test1", Guid.NewGuid().ToString() }, { "Test2", Guid.NewGuid().ToString() }, { "Test3", Guid.NewGuid().ToString() }, { "Test4", Guid.NewGuid().ToString() }, { "Test5", Guid.NewGuid().ToString() }, { "Test6", Guid.NewGuid().ToString() }, { "Test7", Guid.NewGuid().ToString() } }; var state2 = new Dictionary <string, string> { { "Test8", Guid.NewGuid().ToString() }, { "Test9", Guid.NewGuid().ToString() }, { "Test10", Guid.NewGuid().ToString() } }; stateManager.Setup(manager => manager.GetStateAsync <Dictionary <string, string> >(_stateName, It.IsAny <CancellationToken>())) .Returns(Task.FromResult(state1)) .Verifiable(); stateManager.Setup(manager => manager.SetStateAsync(_stateName, state1, It.IsAny <CancellationToken>())) .Verifiable(); UniqueIndexActor testDemoActor = await CreateActor(stateManager.Object, "Test UniqueIndexActor"); await testDemoActor.Add("Test8", state2["Test8"]); await testDemoActor.Add("Test9", state2["Test9"]); await testDemoActor.Add("Test10", state2["Test10"]); state1.Should().HaveCount(10); state1.Should().Contain(state2); stateManager.VerifyAll(); }