diff --git a/tests/test_storage.py b/tests/test_storage.py
index 30f0213393a10345581b98dad1ef3b930b3d0057..e5abe7826605e39b872bfbb9ac5399d3bee2161b 100644
--- a/tests/test_storage.py
+++ b/tests/test_storage.py
@@ -112,6 +112,9 @@ def test_storage_check_policy(
     radosuser_admin.s3.Bucket(bucket_name).Versioning().suspend()
     assert not radosuser_test1.storage_check_policy(bucket_name)
 
+    # error handling
+    assert not radosuser_admin.storage_check_policy("!invalid_bucket_name")
+
 
 def test_storage_backup_usage(
     tmpworkdir: str,