public void TestAddCourseToStudent()
{
var student1 = new Student("Tom Erik", "*****@*****.**");
var course1 = new Course("StartIT");
var courseList = new CourseList();
var studentList = new StudentList();
var addStudent = studentList.AddStudent(student1);
courseList.AddCourse(course1);
var result = studentList.AddCourseToStudent(course1, student1);
Assert.AreEqual(true, result);
}