def setUpClass(cls):
        super(TestComputeGrades, cls).setUpClass()
        cls.command = compute_grades.Command()

        cls.courses = [CourseFactory.create() for _ in range(cls.num_courses)]
        cls.course_keys = [six.text_type(course.id) for course in cls.courses]
        cls.users = [get_user_model().objects.create(username='******'.format(idx)) for idx in range(cls.num_users)]

        for user in cls.users:
            for course in cls.courses:
                CourseEnrollment.enroll(user, course.id)
    def setUpClass(cls):
        super().setUpClass()
        cls.command = compute_grades.Command()

        cls.courses = [CourseFactory.create() for _ in range(cls.num_courses)]
        cls.course_keys = [str(course.id) for course in cls.courses]
        cls.users = [UserFactory.create(username=f'user{idx}') for idx in range(cls.num_users)]

        for user in cls.users:
            for course in cls.courses:
                CourseEnrollment.enroll(user, course.id)