public void AddBills()
        {
            var listOfBudgets = new CoreBudgets();
            Mock <IBudgetRepository> mockBudgetRepository = new Mock <IBudgetRepository>();

            mockBudgetRepository.Setup(x => x.AddBudgetAsync(listOfBudgets)).Verifiable();
            var billController = new BudgetsController(mockBudgetRepository.Object);

            billController.Should().NotBeNull();
        }