public void AddCategory_WithCorrectNewName()
        {
            // Arrange
            var categoryNameToAdd = "newCategoryAdded";
            var budgetToAdd       = 13;

            // Act
            _categoryManager.AddCategory(categoryNameToAdd, budgetToAdd);

            // Assert
            var categoryName = _categoryManager.GetCategoryNameAtIndex(_categoryManager.GetCategoryCount() - 1);

            Assert.AreEqual(categoryNameToAdd, categoryName);
            Assert.AreEqual(budgetToAdd, _categoryManager.GetBudgetForCategory(categoryName));
        }