Add a test that shows that CourseModes aren't deleted when CourseOverview versions are updated

common/djangoapps/course_modes/tests/test_models.py

@@ -21,6 +21,7 @@ from six.moves import zip
 from course_modes.helpers import enrollment_mode_display
 from course_modes.models import CourseMode, Mode, get_cosmetic_display_price, invalidate_course_mode_cache
 from course_modes.tests.factories import CourseModeFactory
+from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
 
@@ -523,6 +524,19 @@ class CourseModeModelTest(TestCase):
         self.assertEqual(CourseMode.is_masters_only(self.course_key), expected_is_masters_only)
 
 
+class TestCourseOverviewIntegration(ModuleStoreTestCase):
+    def test_course_overview_version_update(self):
+        course = CourseFactory.create()
+        course_overview = CourseOverview.get_from_id(course.id)
+        course_overview.version -= 1
+        course_overview.save()
+        course_mode = CourseModeFactory.create(course_id=course_overview.id)
+
+        assert CourseMode.objects.filter(pk=course_mode.pk).exists()
+        CourseOverview.get_from_id(course.id)
+        assert CourseMode.objects.filter(pk=course_mode.pk).exists()
+
+
 class TestDisplayPrices(ModuleStoreTestCase):
     @override_settings(PAID_COURSE_REGISTRATION_CURRENCY=["USD", "$"])
     def test_get_cosmetic_display_price(self):