public void TestAddStudentToCourse()
{
var course1 = new Course("StartIT");
var course2 = new Course("GetIT");
var courseList = new CourseList();
var student = new Student("Tom Erik", "*****@*****.**");
courseList.AddCourse(course1);
courseList.AddCourse(course2);
var test = courseList.AddStudentToCourse(student, course2);
Assert.AreEqual(true, test);
}