diff --git a/assets/constants.js b/assets/constants.js
index 966dfdd0977c..6ebdd5805861 100644
--- a/assets/constants.js
+++ b/assets/constants.js
@@ -16,5 +16,6 @@ var constants = {
     "Mathematics", "Medicine", "Music", "Philosophy", "Physics", "Poetry",
     "Probability", "Programming", "Puzzles", "Reading", "Spanish", "Sport",
     "Statistics", "Trigonometry", "Welcome"],
-  "DISABLED_EXPLORATION_IDS": ["5"]
+  "DISABLED_EXPLORATION_IDS": ["5"],
+  "TESTING_CONSTANTS": "test"
 };
diff --git a/constants_test.py b/constants_test.py
index 8e9daf67b2d4..47b67ef378a3 100644
--- a/constants_test.py
+++ b/constants_test.py
@@ -31,3 +31,4 @@ def test_constants_file_contains_valid_json(self):
         with open(os.path.join('assets', 'constants.js'), 'r') as f:
             json = constants.parse_json(f)
             self.assertTrue(isinstance(json, dict))
+            self.assertTrue(json["TESTING_CONSTANTS"] == "test")