Allow removing a verification deadline through the Commerce API.

ECOM-3268

lms/djangoapps/commerce/api/v1/models.py

@@ -59,8 +59,7 @@ class Course(object):
         """ Save the CourseMode objects to the database. """
 
         # Override the verification deadline for the course (not the individual modes)
-        if self.verification_deadline is not None:
-            VerificationDeadline.set_deadline(self.id, self.verification_deadline, is_explicit=True)
+        VerificationDeadline.set_deadline(self.id, self.verification_deadline, is_explicit=True)
 
         for mode in self.modes:
             mode.course_id = self.id

lms/djangoapps/commerce/api/v1/tests/test_views.py

@@ -203,6 +203,29 @@ class CourseRetrieveUpdateViewTests(CourseApiViewTestMixin, ModuleStoreTestCase)
         self.assertEqual(response.status_code, 200)
         self.assertEqual(VerificationDeadline.deadline_for_course(self.course.id), verification_deadline)
 
+    def test_update_remove_verification_deadline(self):
+        """
+        Verify that verification deadlines can be removed through the API.
+        """
+        verification_deadline = datetime(year=1915, month=5, day=7, tzinfo=pytz.utc)
+        response, __ = self._get_update_response_and_expected_data(None, verification_deadline)
+        self.assertEqual(VerificationDeadline.deadline_for_course(self.course.id), verification_deadline)
+
+        verified_mode = CourseMode(
+            mode_slug=u'verified',
+            min_price=200,
+            currency=u'USD',
+            sku=u'ABC123',
+            expiration_datetime=None
+        )
+        updated_data = self._serialize_course(self.course, [verified_mode], None)
+        updated_data['verification_deadline'] = None
+
+        response = self.client.put(self.path, json.dumps(updated_data), content_type=JSON_CONTENT_TYPE)
+
+        self.assertEqual(response.status_code, 200)
+        self.assertIsNone(VerificationDeadline.deadline_for_course(self.course.id))
+
     def test_update_overwrite(self):
         """ Verify that data submitted via PUT overwrites/deletes modes that are
         not included in the body of the request. """