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[test] Ensure stable object id in test checkpoint data builder #20839

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Jan 10, 2025
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[test] Ensure stable object id in test checkpoint data builder #20839

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6 changes: 5 additions & 1 deletion crates/sui-types/src/test_checkpoint_data_builder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -489,8 +489,12 @@ impl TestCheckpointDataBuilder {
}

/// Derive an object ID from an index. This is used to conveniently represent an object's ID.
/// We ensure that the bytes of object IDs have a stable order that is the same as object_idx.
pub fn derive_object_id(object_idx: u64) -> ObjectID {
ObjectID::derive_id(TransactionDigest::ZERO, object_idx)
// We achieve this by setting the first 8 bytes of the object ID to the object_idx.
let mut bytes = [0; ObjectID::LENGTH];
bytes[0..8].copy_from_slice(&object_idx.to_le_bytes());
ObjectID::from_bytes(bytes).unwrap()
}

/// Derive an address from an index.
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