pytest_plugin: fix mutable kwarg defaults

jupyter-server · Sep 8, 2021 · a88e36f · a88e36f
1 parent 7c41332
commit a88e36f
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/jupyter_server/pytest_plugin.py b/jupyter_server/pytest_plugin.py
@@ -316,7 +316,11 @@ async def my_test(jp_fetch):
             ...
     """
 
-    def client_fetch(*parts, headers={}, params={}, **kwargs):
+    def client_fetch(*parts, headers=None, params=None, **kwargs):
+        if not headers:
+            headers = {}
+        if not params:
+            params = {}
         # Handle URL strings
         path_url = url_escape(url_path_join(*parts), plus=False)
         base_path_url = url_path_join(jp_base_url, path_url)
@@ -358,7 +362,11 @@ async def my_test(jp_fetch, jp_ws_fetch):
             ...
     """
 
-    def client_fetch(*parts, headers={}, params={}, **kwargs):
+    def client_fetch(*parts, headers=None, params=None, **kwargs):
+        if not headers:
+            headers = {}
+        if not params:
+            params = {}
         # Handle URL strings
         path_url = url_escape(url_path_join(*parts), plus=False)
         base_path_url = url_path_join(jp_base_url, path_url)