MA-635 Block Mobile Content for unfulfilled milestones

Previously, the mobile api did not check for pre-requisite courses
or entrance exams. This change checks for these milestones and then
returns course content accordingly.

lms/djangoapps/mobile_api/testutils.py

@@ -13,18 +13,21 @@ Test utilities for mobile API tests:
 # pylint: disable=no-member
 import ddt
 from mock import patch
-from rest_framework.test import APITestCase
+
 from django.core.urlresolvers import reverse
 
-from opaque_keys.edx.keys import CourseKey
-from courseware.tests.factories import UserFactory
+from rest_framework.test import APITestCase
 
+from opaque_keys.edx.keys import CourseKey
+
+from courseware.tests.factories import UserFactory
 from student import auth
 from student.models import CourseEnrollment
-
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
 
+from mobile_api.test_milestones import MobileAPIMilestonesMixin
+
 
 class MobileAPITestCase(ModuleStoreTestCase, APITestCase):
     """
@@ -124,7 +127,7 @@ class MobileAuthUserTestMixin(MobileAuthTestMixin):
 
 
 @ddt.ddt
-class MobileCourseAccessTestMixin(object):
+class MobileCourseAccessTestMixin(MobileAPIMilestonesMixin):
     """
     Test Mixin for testing APIs marked with mobile_course_access.
     (Use MobileEnrolledCourseAccessTestMixin when verify_enrolled is set to True.)