test: DB roundtrip tests for storage/blockchain and storage/txpool - #3
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storage/blockchain had a single test (the compact_history proptest) and storage/txpool had none; the DB read/write ops were untested. Add in-crate #[cfg(test)] roundtrip modules that open a temporary fjall DB and exercise the real ops. The block_infos/tx_infos tapes are positional (tape index == block height), so the real mainnet-height fixtures cannot be round-tripped by height in an empty DB. Two complementary harnesses are used: - blockchain: real fixtures (V1, V2, 0-tx) for height-independent tx/output/block blob fidelity (get_tx pruned+prunable reassembly, output lookups, get_block via a captured BlockInfo), plus a synthetic miner-only genesis chain for the natural height-keyed lifecycle (get_block by height/hash, get_block_complete_entry pruned+non-pruned, chain_height/top_block_height, pop_block restores state). - txpool: add/get roundtrip (V1 + V2, stem flag), key-image double-spend rejection, and remove + re-insert. Adds cuprate-test-utils + tempfile to storage/blockchain dev-dependencies (storage/txpool already had them).
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Closes #13
Summary
Adds the first direct roundtrip tests for the storage layer's DB ops.
storage/blockchainhad only thecompact_historyproptest andstorage/txpoolhad none — the read/write logic inops/{block,tx,output}.rsandops/{key_images,tx_read,tx_write}.rswas untested. Implementsissues/S08-1-storage-roundtrip-tests.md.Why
Storage is the chain-integrity layer where a bug means permanent corruption. This was the largest test-coverage gap before a confident public release.
Key design note: positional tapes
The
block_infos/tx_infostapes are positional (tape index == block height). The real mainnet-height fixtures (BLOCK_V1_TX2@202609, etc.) therefore can't be round-tripped by height in an empty DB. Two complementary harnesses are used:get_txreal pruned+prunable reassembly (V1 viav1_prunable_blobs, V2 via pruning stripe), pre-RCT + RCT output lookups, andget_blockvia a capturedBlockInfo.get_blockby height/hash,get_block_complete_entry(pruned + non-pruned),chain_height/top_block_height, andpop_blockrestoring prior state. Needs no consensus machinery (mirrorscuprated's reorg-test block generation).Changes
storage/blockchain/src/ops/tests.rs(new) — 4 tests: fixture block roundtrip (0-tx/V1/V2), V1 tx+output, V2 tx+output, synthetic-chain lifecycle + pop.storage/txpool/src/ops/tests.rs(new) — 3 tests: add/get roundtrip (V1+V2, stem flag), key-image double-spend rejection, remove + re-insert.#[cfg(test)] mod tests;; addedcuprate-test-utils+tempfiletostorage/blockchaindev-deps (txpool already had them).Testing
cargo test -p cuprate-blockchain -p cuprate-txpool— 8 pass (5 blockchain incl. the pre-existing proptest, 3 txpool).cargo clippy -p cuprate-blockchain -p cuprate-txpool --all-targets --all-features -- -D warnings— clean.cargo fmt --check— clean.Acceptance criteria
cargo test -p cuprate-blockchain -p cuprate-txpoolexercises real DB operations