There may be a bug in the fuzz test implementation for PartiallyDownloadedBlock in src/test/fuzz/partially_downloaded_block.cpp. Please investigate the following:
- The fuzz test performs various operations relating to compact blocks and partial downloads, including marking transactions as available, manipulating mempool/extra_txn, and reconstructing blocks.
- It uses assertions to check the state after calling
InitDataandFillBlockonPartiallyDownloadedBlock. - The test may not properly handle some edge cases or error conditions, especially with regard to skipped/missing transactions or with the mock check block logic.
Please review the fuzz test logic for correctness, robustness, and potential failure to catch certain classes of errors, especially around:
- Handling of skip/missing transactions and the related assertions
- The assignment or logic in
check_block_mock - Any cases where the test could pass erroneously or fail to catch regressions
Additional context may be required depending on the specific bug observed or the test coverage intended.