Add a test

common/djangoapps/student/tests/test_models.py

@@ -207,6 +207,43 @@ class CourseEnrollmentTests(SharedModuleStoreTestCase):
         self.assertIsNotNone(enrollment.schedule)
         self.assertIsNone(enrollment.upgrade_deadline)
 
+    @skip_unless_lms
+    # NOTE: We mute the post_save signal to prevent Schedules from being created for new enrollments
+    @factory.django.mute_signals(signals.post_save)
+    def test_enrollments_not_deleted(self):
+        """ Recreating a CourseOverview with an outdated version should not delete the associated enrollment. """
+        course = CourseFactory(self_paced=True)
+        CourseModeFactory(
+            course_id=course.id,
+            mode_slug=CourseMode.VERIFIED,
+            # This must be in the future to ensure it is returned by downstream code.
+            expiration_datetime=datetime.datetime.now(pytz.UTC) + datetime.timedelta(days=30),
+        )
+
+        # Create a CourseOverview with an outdated version
+        course_overview = CourseOverview.load_from_module_store(course.id)
+        course_overview.version = CourseOverview.VERSION - 1
+        course_overview.save()
+
+        # Create an inactive enrollment with this course overview
+        enrollment = CourseEnrollmentFactory(
+            user=self.user,
+            course_id=course.id,
+            mode=CourseMode.AUDIT,
+            course=course_overview,
+        )
+
+        # Re-fetch the CourseOverview record, which as a side effect,
+        # will recreate the record to update the version.
+        course_overview_new = CourseOverview.get_from_id(course.id)
+        assert(course_overview_new.version == CourseOverview.VERSION)
+        assert(course_overview_new.id != course_overview.id)
+
+        # Ensure that the enrollment record was not deleted during this re-creation
+        enrollment_refetched = CourseEnrollment.objects.filter(id=enrollment.id)
+        assert(enrollment_refetched.exists())
+        assert(enrollment_refetched.all()[0] == enrollment)
+
 
 class PendingNameChangeTests(SharedModuleStoreTestCase):
     """