diff --git a/test/test_persistent_dict.py b/test/test_persistent_dict.py
index 53afd7774cb3a7ff7dca6c1fc7f7058853e51a2d..b8954b41e238b80eb4081804e4454223b2770258 100644
--- a/test/test_persistent_dict.py
+++ b/test/test_persistent_dict.py
@@ -192,6 +192,10 @@ def test_write_once_persistent_dict_storage_and_lookup(in_mem_cache_size):
         with pytest.raises(ReadOnlyEntryError):
             pdict[0] = 2
 
+        # check not found
+        with pytest.raises(NoSuchEntryError):
+            pdict[1]
+
     finally:
         shutil.rmtree(tmpdir)