public void TestCreateGroupChat()
        {
            mockConversationRepository.Setup(x => x.Add(It.IsAny <Conversation>())).Returns(conversation);
            var          chatService        = new ChatService.Services.ChatService(mockConversationRepository.Object, mockMessageRepository.Object);
            Conversation conversationActual = chatService.CreateGroupChat(conversation);

            Assert.AreEqual(conversationActual, conversation);
        }