diff --git a/tests/test_ws_signed_payload.py b/tests/test_ws_signed_payload.py
index a4e80b5..8bdca1c 100644
--- a/tests/test_ws_signed_payload.py
+++ b/tests/test_ws_signed_payload.py
@@ -24,6 +24,9 @@
 """
 from __future__ import annotations
 
+import asyncio
+import hashlib
+import hmac
 import json
 import time
 
@@ -35,6 +38,7 @@
     verify_hmac_signature,
 )
 
+
 # --- helpers ---------------------------------------------------------------