Prevent fail on u8 overflow (#418)

* Prevent u8 overflow
MystenLabs · Feb 11, 2022 · a6a9957 · a6a9957
1 parent d75b684
commit a6a9957
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/fastpay_core/src/unit_tests/authority_tests.rs b/fastpay_core/src/unit_tests/authority_tests.rs
@@ -1165,7 +1165,8 @@ async fn test_get_latest_parent_entry() {
     // The objects just after the gas object also returns None
     let mut x = gas_object_id.to_vec();
     let last_index = x.len() - 1;
-    x[last_index] += 1;
+    // Prevent overflow
+    x[last_index] = u8::MAX - x[last_index];
     let unknown_object_id: ObjectID = x.try_into().unwrap();
     assert!(authority_state
         .get_latest_parent_entry(unknown_object_id)