diff --git a/sc_core/src/private_state.rs b/sc_core/src/private_state.rs
index 9e46333b..7803dc62 100644
--- a/sc_core/src/private_state.rs
+++ b/sc_core/src/private_state.rs
@@ -256,4 +256,11 @@ mod tests {
         assert_eq!(blob, deserialized);
     }
 
+    #[test]
+    fn test_calculate_offset_slot() {
+        assert_eq!(calculate_offset_slot(0), 0);
+        assert_eq!(calculate_offset_slot(PRIVATE_BLOB_SIZE), 1);
+        assert_eq!(calculate_offset_slot(PRIVATE_BLOB_SIZE * 2 - 1), 1);
+    }
+
 }