diff --git a/tests/test_blueprints.py b/tests/test_blueprints.py
index d9f5cd61..9ab387be 100644
--- a/tests/test_blueprints.py
+++ b/tests/test_blueprints.py
@@ -41,6 +41,7 @@ def test_bp_strict_slash():
 
     request, response = app.test_client.get('/get')
     assert response.text == 'OK'
+    assert response.json == None
 
     request, response = app.test_client.get('/get/')
     assert response.status == 404