public void CheckFindBySources() { // Arrange var conversationRepo = new Mock <IRepository <Conversation> >(); conversationRepo.Setup(t => t.FindAll()).Returns(new List <Conversation> { new Conversation { Id = 1, Subject = "Conversation Test 1", IsDeleted = false, IsHidden = false, Source = ConversationSource.FacebookMessage }, new Conversation { Id = 1, Subject = "Conversation Test 2", IsDeleted = false, IsHidden = false, Source = ConversationSource.FacebookVisitorPost } }.AsQueryable()); var conversationService = new ConversationService(agentService.Object, departmentService.Object, filterRepo.Object, filterExpressionFactory.Object, logRepo.Object); conversationService.Repository = conversationRepo.Object; // Act var conversation = conversationService.Find(1, new ConversationSource[] { ConversationSource.FacebookVisitorPost, ConversationSource.FacebookWallPost }); // Assert Assert.Equal("Conversation Test 2", conversation.Subject); }