test(rocksdb): re-enable test_open_rocksdict with a faithful rocksdict mock

[wbarnha]

Description

Re-enables TestRocksDBOptions::test_open_rocksdict, skipped as "Need to make mock BlockBasedOptions".

The test patched only faust.stores.rocksdb.rocksdict, but the store's use_rocksdict path also uses the bare module-level Options/DB names, so Options(raw_mode=True) reached the real object and raised TypeError: Options() takes no arguments (rocksdict isn't installed in CI).

Fix (test-only): mock the full external rocksdict surface used by the store — Options, DB, BlockBasedOptions, Cache, ReadOptions, BlockBasedIndexType — and assert the store drives it correctly: Options(raw_mode=True), create_if_missing(True), the field-driven setters (max_open_files, write_buffer_size, …), the block-based table factory (bloom filter, block cache, binary-search index), DB(str(path), options=…, access_type=…), and set_read_options. Only the external library is mocked; open()/as_options() run for real. Assertions are strictly stronger than the stale original.

Verification

tests/unit/stores/test_rocksdb.py → 96 passed; flake8/black/isort clean. Fix was produced under adversarial faithfulness review (confirmed no gutted assertions, mocks stand in only for the external lib).

🤖 Generated with Claude Code

---

Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.36%. Comparing base (f77a678) to head (86c7c03).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #720      +/-   ##
==========================================
+ Coverage   94.18%   94.36%   +0.17%     
==========================================
  Files         104      104              
  Lines       11154    11154              
  Branches     1202     1202              
==========================================
+ Hits        10505    10525      +20     
+ Misses        548      530      -18     
+ Partials      101       99       -2     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.