public void Test_DropCourse_DropsSelectedCourse()
{
Student testStudent = new Student("Bob", enrollmentDate);
testStudent.Save();
Course testCourse1 = new Course("CS101", 1);
testCourse1.Save();
testStudent.AddCourse(testCourse1.GetId());
Course testCourse2 = new Course("PHIL101", 2);
testCourse2.Save();
testStudent.AddCourse(testCourse2.GetId());
testStudent.DropCourse(testCourse1.GetId());
List<Course> resultList = testStudent.GetCourses();
List<Course> expectedList= new List<Course>{testCourse2};
Assert.Equal(expectedList, resultList);
}