public void CountQuestionFromCategoryTest()
        {
            var dbCategory = DbContext.Categories.FirstOrDefault();

            Assert.IsTrue(dbCategory != null);

            var countQuestion   = CatRep.CountQuestionFromCategory(dbCategory.Id);
            var dbCountQuestion = DbContext.Questions.Where(x => x.CategoryId == dbCategory.Id).Count();

            Assert.AreEqual(dbCountQuestion, countQuestion);
            Assert.AreEqual(countQuestion, dbCategory.Questions.Count);
        }