def test_access_on_course_with_pre_requisites(self):
        """
        Test course access when a course has pre-requisite course yet to be completed
        """
        seed_milestone_relationship_types()
        user = UserFactory.create()

        pre_requisite_course = CourseFactory.create(org="test_org", number="788", run="test_run")

        pre_requisite_courses = [unicode(pre_requisite_course.id)]
        course = CourseFactory.create(
            org="test_org", number="786", run="test_run", pre_requisite_courses=pre_requisite_courses
        )
        set_prerequisite_courses(course.id, pre_requisite_courses)

        # user should not be able to load course even if enrolled
        CourseEnrollmentFactory(user=user, course_id=course.id)
        response = access._has_access_course_desc(user, "view_courseware_with_prerequisites", course)
        self.assertFalse(response)
        self.assertIsInstance(response, access_response.MilestoneError)
        # Staff can always access course
        staff = StaffFactory.create(course_key=course.id)
        self.assertTrue(access._has_access_course_desc(staff, "view_courseware_with_prerequisites", course))

        # User should be able access after completing required course
        fulfill_course_milestone(pre_requisite_course.id, user)
        self.assertTrue(access._has_access_course_desc(user, "view_courseware_with_prerequisites", course))

    def test_courseware_page_unfulfilled_prereqs(self):
        """
        Test courseware access when a course has pre-requisite course yet to be completed
        """
        seed_milestone_relationship_types()
        pre_requisite_course = CourseFactory.create(org="edX", course="900", run="test_run")

        pre_requisite_courses = [unicode(pre_requisite_course.id)]
        course = CourseFactory.create(
            org="edX", course="1000", run="test_run", pre_requisite_courses=pre_requisite_courses
        )
        set_prerequisite_courses(course.id, pre_requisite_courses)

        test_password = "t3stp4ss.!"
        user = UserFactory.create()
        user.set_password(test_password)
        user.save()
        self.login(user.email, test_password)
        CourseEnrollmentFactory(user=user, course_id=course.id)

        url = reverse("courseware", args=[unicode(course.id)])
        response = self.client.get(url)
        self.assertRedirects(response, reverse("dashboard"))
        self.assertEqual(response.status_code, 302)

        fulfill_course_milestone(pre_requisite_course.id, user)
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)

    def test_course_listing_has_pre_requisite_courses(self):
        """
        Creates four courses. Enroll test user in all courses
        Sets two of them as pre-requisites of another course.
        Checks course where pre-requisite course is set has appropriate info.
        """
        seed_milestone_relationship_types()
        course_location2 = self.store.make_course_key('Org1', 'Course2', 'Run2')
        self._create_course_with_access_groups(course_location2)
        pre_requisite_course_location = self.store.make_course_key('Org1', 'Course3', 'Run3')
        self._create_course_with_access_groups(pre_requisite_course_location)
        pre_requisite_course_location2 = self.store.make_course_key('Org1', 'Course4', 'Run4')
        self._create_course_with_access_groups(pre_requisite_course_location2)
        # create a course with pre_requisite_courses
        pre_requisite_courses = [
            unicode(pre_requisite_course_location),
            unicode(pre_requisite_course_location2),
        ]
        course_location = self.store.make_course_key('Org1', 'Course1', 'Run1')
        self._create_course_with_access_groups(course_location, {
            'pre_requisite_courses': pre_requisite_courses
        })

        set_prerequisite_courses(course_location, pre_requisite_courses)
        # get dashboard
        course_enrollment_pairs = list(get_course_enrollment_pairs(self.student, None, []))
        courses_having_prerequisites = frozenset(course.id for course, _enrollment in course_enrollment_pairs
                                                 if course.pre_requisite_courses)
        courses_requirements_not_met = get_pre_requisite_courses_not_completed(
            self.student,
            courses_having_prerequisites
        )
        self.assertEqual(len(courses_requirements_not_met[course_location]['courses']), len(pre_requisite_courses))

    def test_courseware_access(self):
        self.login()

        course_with_prereq = CourseFactory.create(start=self.LAST_WEEK, mobile_available=True)
        prerequisite_course = CourseFactory.create()
        set_prerequisite_courses(course_with_prereq.id, [unicode(prerequisite_course.id)])

        # Create list of courses with various expected courseware_access responses and corresponding expected codes
        courses = [
            course_with_prereq,
            CourseFactory.create(start=self.NEXT_WEEK, mobile_available=True),
            CourseFactory.create(visible_to_staff_only=True, mobile_available=True),
            CourseFactory.create(start=self.LAST_WEEK, mobile_available=True, visible_to_staff_only=False),
        ]

        expected_error_codes = [
            MilestoneAccessError().error_code,  # 'unfulfilled_milestones'
            StartDateError(self.NEXT_WEEK).error_code,  # 'course_not_started'
            VisibilityError().error_code,  # 'not_visible_to_user'
            None,
        ]

        # Enroll in all the courses
        for course in courses:
            self.enroll(course.id)

        # Verify courses have the correct response through error code. Last enrolled course is first course in response
        response = self.api_response()
        for course_index in range(len(courses)):
            result = response.data[course_index]['course']['courseware_access']
            self.assertEqual(result['error_code'], expected_error_codes[::-1][course_index])

            if result['error_code'] is not None:
                self.assertFalse(result['has_access'])

    def test_access_on_course_with_pre_requisites(self):
        """
        Test course access when a course has pre-requisite course yet to be completed
        """
        user = UserFactory.create()

        pre_requisite_course = CourseFactory.create(
            org='test_org', number='788', run='test_run'
        )

        pre_requisite_courses = [unicode(pre_requisite_course.id)]
        course = CourseFactory.create(
            org='test_org', number='786', run='test_run', pre_requisite_courses=pre_requisite_courses
        )
        set_prerequisite_courses(course.id, pre_requisite_courses)

        # user should not be able to load course even if enrolled
        CourseEnrollmentFactory(user=user, course_id=course.id)
        response = access._has_access_course(user, 'load', course)
        self.assertFalse(response)
        self.assertIsInstance(response, access_response.MilestoneAccessError)
        # Staff can always access course
        staff = StaffFactory.create(course_key=course.id)
        self.assertTrue(access._has_access_course(staff, 'load', course))

        # User should be able access after completing required course
        fulfill_course_milestone(pre_requisite_course.id, user)
        self.assertTrue(access._has_access_course(user, 'load', course))

    def test_course_with_prereq(self):
        """
        Simulate having a course which has closed enrollments that has
        a pre-req course
        """
        pre_requisite_course = CourseFactory.create(
            org='edX',
            course='900',
            display_name='pre requisite course',
        )

        pre_requisite_courses = [unicode(pre_requisite_course.id)]

        # for this failure to occur, the enrollment window needs to be in the past
        course = CourseFactory.create(
            org='edX',
            course='1000',
            display_name='course that has pre requisite',
            # closed enrollment
            enrollment_start=datetime.datetime(2013, 1, 1),
            enrollment_end=datetime.datetime(2014, 1, 1),
            start=datetime.datetime(2013, 1, 1),
            end=datetime.datetime(2030, 1, 1),
            pre_requisite_courses=pre_requisite_courses,
        )
        set_prerequisite_courses(course.id, pre_requisite_courses)

        resp = self.client.get('/')
        self.assertEqual(resp.status_code, 200)

        # make sure both courses are visible in the catalog
        self.assertIn('pre requisite course', resp.content)
        self.assertIn('course that has pre requisite', resp.content)

    def test_course_milestone_collected(self):
        student = UserFactory()
        course = CourseFactory.create(org='edx', number='998', display_name='Test Course')
        pre_requisite_course = CourseFactory.create(org='edx', number='999', display_name='Pre requisite Course')
        # set pre-requisite course
        set_prerequisite_courses(course.id, [unicode(pre_requisite_course.id)])
        # get milestones collected by user before completing the pre-requisite course
        completed_milestones = milestones_achieved_by_user(student, unicode(pre_requisite_course.id))
        self.assertEqual(len(completed_milestones), 0)

        GeneratedCertificateFactory.create(
            user=student,
            course_id=pre_requisite_course.id,
            status=CertificateStatuses.generating,
            mode='verified'
        )
        # get milestones collected by user after user has completed the pre-requisite course
        completed_milestones = milestones_achieved_by_user(student, unicode(pre_requisite_course.id))
        self.assertEqual(len(completed_milestones), 1)
        self.assertEqual(completed_milestones[0]['namespace'], unicode(pre_requisite_course.id))

    def test_about_page_unfulfilled_prereqs(self):
        seed_milestone_relationship_types()
        pre_requisite_course = CourseFactory.create(
            org='edX',
            course='900',
            display_name='pre requisite course',
        )

        pre_requisite_courses = [unicode(pre_requisite_course.id)]

        # for this failure to occur, the enrollment window needs to be in the past
        course = CourseFactory.create(
            org='edX',
            course='1000',
            # closed enrollment
            enrollment_start=datetime.datetime(2013, 1, 1),
            enrollment_end=datetime.datetime(2014, 1, 1),
            start=datetime.datetime(2013, 1, 1),
            end=datetime.datetime(2030, 1, 1),
            pre_requisite_courses=pre_requisite_courses,
        )
        set_prerequisite_courses(course.id, pre_requisite_courses)

        self.setup_user()
        self.enroll(self.course, True)
        self.enroll(pre_requisite_course, True)

        url = reverse('about_course', args=[unicode(course.id)])
        resp = self.client.get(url)
        self.assertEqual(resp.status_code, 200)
        pre_requisite_courses = get_prerequisite_courses_display(course)
        pre_requisite_course_about_url = reverse('about_course', args=[unicode(pre_requisite_courses[0]['key'])])
        self.assertIn("<span class=\"important-dates-item-text pre-requisite\"><a href=\"{}\">{}</a></span>"
                      .format(pre_requisite_course_about_url, pre_requisite_courses[0]['display']),
                      resp.content.strip('\n'))

        url = reverse('about_course', args=[unicode(pre_requisite_course.id)])
        resp = self.client.get(url)
        self.assertEqual(resp.status_code, 200)

    def test_courseware_page_unfulfilled_prereqs(self):
        """
        Test courseware access when a course has pre-requisite course yet to be completed
        """
        pre_requisite_course = CourseFactory.create(
            org='edX',
            course='900',
            run='test_run',
        )

        pre_requisite_courses = [unicode(pre_requisite_course.id)]
        course = CourseFactory.create(
            org='edX',
            course='1000',
            run='test_run',
            pre_requisite_courses=pre_requisite_courses,
        )
        set_prerequisite_courses(course.id, pre_requisite_courses)

        test_password = 't3stp4ss.!'
        user = UserFactory.create()
        user.set_password(test_password)
        user.save()
        self.login(user.email, test_password)
        CourseEnrollmentFactory(user=user, course_id=course.id)

        url = reverse('courseware', args=[unicode(course.id)])
        response = self.client.get(url)
        self.assertRedirects(
            response,
            reverse(
                'dashboard'
            )
        )
        self.assertEqual(response.status_code, 302)

        fulfill_course_milestone(pre_requisite_course.id, user)
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)

    def test_pre_requisites_appear_on_dashboard(self):
        """
        When a course has a prerequisite, the dashboard should display the prerequisite.
        If we remove the prerequisite and access the dashboard again, the prerequisite
        should not appear.
        """
        self.pre_requisite_course = CourseFactory.create(org='edx', number='999', display_name='Pre requisite Course')
        self.course = CourseFactory.create(
            org='edx',
            number='998',
            display_name='Test Course',
            pre_requisite_courses=[unicode(self.pre_requisite_course.id)]
        )
        self.course_enrollment = CourseEnrollmentFactory(course_id=self.course.id, user=self.user)

        set_prerequisite_courses(self.course.id, [unicode(self.pre_requisite_course.id)])
        response = self.client.get(reverse('dashboard'))
        self.assertIn('<div class="prerequisites">', response.content)

        remove_prerequisite_course(self.course.id, get_course_milestones(self.course.id)[0])
        response = self.client.get(reverse('dashboard'))
        self.assertNotIn('<div class="prerequisites">', response.content)

    def test_about_page_unfulfilled_prereqs(self):
        pre_requisite_course = CourseFactory.create(org="edX", course="901", display_name="pre requisite course")

        pre_requisite_courses = [unicode(pre_requisite_course.id)]

        # for this failure to occur, the enrollment window needs to be in the past
        course = CourseFactory.create(
            org="edX",
            course="1000",
            # closed enrollment
            enrollment_start=datetime.datetime(2013, 1, 1),
            enrollment_end=datetime.datetime(2014, 1, 1),
            start=datetime.datetime(2013, 1, 1),
            end=datetime.datetime(2030, 1, 1),
            pre_requisite_courses=pre_requisite_courses,
        )
        set_prerequisite_courses(course.id, pre_requisite_courses)

        self.setup_user()
        self.enroll(self.course, True)
        self.enroll(pre_requisite_course, True)

        url = reverse("about_course", args=[unicode(course.id)])
        resp = self.client.get(url)
        self.assertEqual(resp.status_code, 200)
        pre_requisite_courses = get_prerequisite_courses_display(course)
        pre_requisite_course_about_url = reverse("about_course", args=[unicode(pre_requisite_courses[0]["key"])])
        self.assertIn(
            '<span class="important-dates-item-text pre-requisite"><a href="{}">{}</a></span>'.format(
                pre_requisite_course_about_url, pre_requisite_courses[0]["display"]
            ),
            resp.content.strip("\n"),
        )

        url = reverse("about_course", args=[unicode(pre_requisite_course.id)])
        resp = self.client.get(url)
        self.assertEqual(resp.status_code, 200)