public void GetExpensesAmount()
        {
            int   userId   = 1;
            float amount   = 30;
            var   mockRepo = new Mock <IExpensesService>();

            mockRepo.Setup(repo => repo.GetExpensesAmountAsync(userId))
            .ReturnsAsync(amount);

            var mockExceptionREpo = new Mock <IExceptionHandler>();
            var mockMapper        = new Mock <IMapper>();
            var controller        = new ExpensesController(mockRepo.Object, mockExceptionREpo.Object, mockMapper.Object);

            // Act
            var okResult = controller.GetExpensesAmount(userId).Result;

            // Assert

            Assert.IsType <OkObjectResult>(okResult);
        }