public void AddStudent_AddsStudentToCourse_true() { Course newCourse = new Course("Intro", "CS101"); Student student1 = new Student("James", DateTime.Today); Student student2 = new Student("Sarah", DateTime.Today); Student student3 = new Student("Grace", DateTime.Today); newCourse.Save(); student1.Save(); student2.Save(); student3.Save(); List <Student> expectedList = new List <Student> { student1, student3 }; newCourse.AddStudent(student1.GetId()); newCourse.AddStudent(student3.GetId()); List <Student> result = newCourse.GetAllStudents(); Assert.Equal(expectedList, result); }