public void TestSchoolAddStudentTwice()
 {
     var school = new School();
     var student = new Student("Name", 12345);
     school.AddStudent(student);
     school.AddStudent(student);
 }
 public void TestSchoolAddStudent()
 {
     var school = new School();
     var student = new Student("Name", 12345);
     school.AddStudent(student);
     Assert.IsTrue(school.Students.Contains(student));
 }
 public void TestSchoolAddStudentNull()
 {
     var school = new School();
     school.AddStudent(null);
 }