diff --git a/lobby/tests.py b/lobby/tests.py
index c6c967d..0721738 100644
--- a/lobby/tests.py
+++ b/lobby/tests.py
@@ -360,7 +360,9 @@ class LieSubmissionTests(TestCase):
         )
 
         self.assertEqual(response.status_code, 400)
-        self.assertEqual(response.json()["error"], "Lie submission window has closed")
+        self.assertEqual(response.json()["error_code"], "lie_submission_window_closed")
+        self.assertEqual(response.json()["locale"], "en")
+        self.assertEqual(response.json()["error"], "Lie submission window has closed.")
 
     def test_submit_lie_rejects_duplicate_submission(self):
         round_question = RoundQuestion.objects.create(
@@ -381,7 +383,9 @@ class LieSubmissionTests(TestCase):
         )
 
         self.assertEqual(response.status_code, 409)
-        self.assertEqual(response.json()["error"], "Lie already submitted for this player")
+        self.assertEqual(response.json()["error_code"], "lie_already_submitted")
+        self.assertEqual(response.json()["locale"], "en")
+        self.assertEqual(response.json()["error"], "Lie has already been submitted for this player.")
 
     def test_submit_lie_requires_session_token(self):
         round_question = RoundQuestion.objects.create(
@@ -423,7 +427,9 @@ class LieSubmissionTests(TestCase):
         )
 
         self.assertEqual(response.status_code, 403)
-        self.assertEqual(response.json()["error"], "Invalid player session token")
+        self.assertEqual(response.json()["error_code"], "invalid_player_session_token")
+        self.assertEqual(response.json()["locale"], "en")
+        self.assertEqual(response.json()["error"], "Player session token is invalid.")
 
 class MixAnswersTests(TestCase):
     def setUp(self):