public void AddManyStudentToClassByFunction2Test()
        {
            List <Student> students = new List <Student>();
            Classes        classes  = new Classes(1, students, "Klasa 1");

            classes.AddStudentToClass(1, "Student 1");
            classes.AddStudentToClass(2, "Student 2");
            classes.AddStudentToClass(3, "Student 3");
            Assert.AreEqual(classes.students.ElementAt(0).Name, "Student 1");
            Assert.AreEqual(classes.students.ElementAt(0).StudentId, 1);
            Assert.AreEqual(classes.students.ElementAt(1).Name, "Student 2");
            Assert.AreEqual(classes.students.ElementAt(1).StudentId, 2);
            Assert.AreEqual(classes.students.ElementAt(2).Name, "Student 3");
            Assert.AreEqual(classes.students.ElementAt(2).StudentId, 3);
        }
        public void AddDuplicateStudentToClassByFunctionTest()
        {
            Student        student1 = new Student(1, "Student 1");
            Student        student2 = new Student(1, "Student 1");
            Student        student3 = new Student(3, "Student 3");
            List <Student> students = new List <Student>();
            Classes        classes  = new Classes(1, students, "Klasa 1");

            Assert.IsTrue(classes.AddStudentToClass(student1));
            Assert.IsFalse(classes.AddStudentToClass(student2));
            Assert.IsTrue(classes.AddStudentToClass(student3));
            Assert.AreEqual(classes.students.ElementAt(0).Name, "Student 1");
            Assert.AreEqual(classes.students.ElementAt(0).StudentId, 1);
            Assert.AreEqual(classes.students.ElementAt(1).Name, "Student 3");
            Assert.AreEqual(classes.students.ElementAt(1).StudentId, 3);
        }