diff --git a/test/test_commit_message_policy.py b/test/test_commit_message_policy.py
index 88ead45c..f944b46f 100644
--- a/test/test_commit_message_policy.py
+++ b/test/test_commit_message_policy.py
@@ -18,10 +18,19 @@ ROOT = Path(__file__).resolve().parents[1]
 SKILL_ROOT = ROOT / "skills" / "commit-message"
 VALIDATOR = SKILL_ROOT / "scripts" / "validate_commit_message.py"
 CI_ENTRY = ROOT / ".gitea" / "ci" / "commit_message_lint.py"
+EVENT_ENV_KEYS = (
+    "GITHUB_EVENT_NAME",
+    "GITHUB_EVENT_PATH",
+    "GITEA_EVENT_NAME",
+    "GITEA_EVENT_PATH",
+)
 
 
 def run(script, *args, env=None):
-    merged = {**os.environ, **(env or {})}
+    merged = os.environ.copy()
+    for key in EVENT_ENV_KEYS:
+        merged.pop(key, None)
+    merged.update(env or {})
     merged.pop("COMMIT_POLICY_PATH", None)
     return subprocess.run(
         [sys.executable, str(script), *args],