diff --git a/examples/javascript/tests/test_js_example.py b/examples/javascript/tests/test_js_example.py
index d2fbd90b..1b078211 100644
--- a/examples/javascript/tests/test_js_example.py
+++ b/examples/javascript/tests/test_js_example.py
@@ -1,18 +1,31 @@
 import pytest
 from flask import template_rendered
 
-@pytest.mark.parametrize(('path', 'template_name'), (('/', 'fetch.html'), ('/plain', 'xhr.html'), ('/fetch', 'fetch.html'), ('/jquery', 'jquery.html')))
+
+@pytest.mark.parametrize(
+    ("path", "template_name"),
+    (
+        ("/", "fetch.html"),
+        ("/plain", "xhr.html"),
+        ("/fetch", "fetch.html"),
+        ("/jquery", "jquery.html"),
+    ),
+)
 def test_index(app, client, path, template_name):
     """Auto-generated docstring for function test_index."""
 
     def check(sender, template, context):
         """Auto-generated docstring for function check."""
         assert template.name == template_name
+
     with template_rendered.connected_to(check, app):
         client.get(path)
 
-@pytest.mark.parametrize(('a', 'b', 'result'), ((2, 3, 5), (2.5, 3, 5.5), (2, None, 2), (2, 'b', 2)))
+
+@pytest.mark.parametrize(
+    ("a", "b", "result"), ((2, 3, 5), (2.5, 3, 5.5), (2, None, 2), (2, "b", 2))
+)
 def test_add(client, a, b, result):
     """Auto-generated docstring for function test_add."""
-    response = client.post('/add', data={'a': a, 'b': b})
-    assert response.get_json()['result'] == result
\ No newline at end of file
+    response = client.post("/add", data={"a": a, "b": b})
+    assert response.get_json()["result"] == result