test: add CDC shift-resilient chunking tests (T-028a/b/c)#40
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Add test_cdc_buzhash_shift_resilient_prefix to directly verify that CDC boundaries do not change when a byte is inserted before the test offset. This complements existing determinism tests by asserting shift-resilient property: chunks before the insertion point remain unchanged after a 1-byte insertion, validating the core CDC guarantee used for efficient diff transfer. Use high-entropy SHA-256 block data (125 KiB) and config (min_size=512) to ensure natural boundary distribution. Cache data generation with @lru_cache to avoid redundant hash computation in future subtests (T-028b/c). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
…28b/c) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
total - 3)共有ヘルパー (
_make_data(),_make_shifted(),_chunks_before_offset(),_assert_prefix_invariant()) でテスト間の重複を排除。Scope
tests/test_chunking.pyのみ (テスト5本: 既存2 + 新規3)Test plan
pytest tests/test_chunking.py -v— 5 tests passedruff check .— All checks passed🤖 Generated with Claude Code