Override settings test decorator

tests/decorators.py

@@ -0,0 +1,17 @@
+import contextlib
+
+from graphql_jwt import settings
+
+
+@contextlib.contextmanager
+def override_settings(**override):
+    restore = {}
+
+    try:
+        for var, value in override.items():
+            restore[var] = getattr(settings, var)
+            setattr(settings, var, value)
+        yield
+    finally:
+        for var, value in restore.items():
+            setattr(settings, var, value)