Fix many wrong-assert-type errors

common/djangoapps/util/tests/test_file.py

@@ -158,7 +158,7 @@ class StoreUploadedFileTestCase(TestCase):
 
         def success_validator(storage, filename):
             """ Validation test function that is a no-op """
-            self.assertTrue("success_file" in os.path.basename(filename))
+            self.assertIn("success_file", os.path.basename(filename))
             store_file_data(storage, filename)
 
         with self.assertRaises(FileValidationException) as error:
@@ -216,7 +216,7 @@ class StoreUploadedFileTestCase(TestCase):
             self.request, "nonunique_file", [".txt"], requested_file_name, self.default_max_size
         )
         self.assertNotEqual(first_stored_file_name, second_stored_file_name)
-        self.assertTrue(requested_file_name in second_stored_file_name)
+        self.assertIn(requested_file_name, second_stored_file_name)
         self._verify_successful_upload(file_storage, second_stored_file_name, file_content)
 
     def _verify_successful_upload(self, storage, file_name, expected_content):

common/djangoapps/util/tests/test_submit_feedback.py

@@ -68,9 +68,9 @@ class SubmitFeedbackTest(TestCase):
         """
         self.assertEqual(response.status_code, 400)
         resp_json = json.loads(response.content)
-        self.assertTrue("field" in resp_json)
+        self.assertIn("field", resp_json)
         self.assertEqual(resp_json["field"], field)
-        self.assertTrue("error" in resp_json)
+        self.assertIn("error", resp_json)
         # There should be absolutely no interaction with Zendesk
         self.assertFalse(zendesk_mock_class.return_value.mock_calls)
         self.assertFalse(datadog_mock.mock_calls)