public void TestAddSubject()
        {
            //prepare
            SubjectModel dut      = new SubjectModel(crud);
            Category     category = new Category();

            category.Id = 5;
            SubjectInfo subject = new SubjectInfo();

            subject.Name     = "schnappie";
            subject.Category = category;

            //test
            bool result = dut.AddSubject(subject);

            //validate
            Assert.IsTrue(result);
        }