fixup! style: Run black on the rest of the project.

Author: feanil

backend/tests/test_api.py

@@ -30,7 +30,9 @@ def user():
     Create and return a test user.
     """
     return User.objects.create_user(
-        username="testuser", email="[email protected]", password="password123"
+        username="testuser",
+        email="[email protected]",
+        password="password123",
     )
 
 
@@ -40,7 +42,9 @@ def another_user():
     Create and return another test user.
     """
     return User.objects.create_user(
-        username="anotheruser", email="[email protected]", password="password123"
+        username="anotheruser",
+        email="[email protected]",
+        password="password123",
     )