docs(03-01): complete library crate and unit tests plan
- SUMMARY.md with 19 unit tests across crypto/compression/format modules - STATE.md updated to Phase 3 Plan 1/2, 43% progress - ROADMAP.md marks 03-01-PLAN.md complete - REQUIREMENTS.md marks TST-03 complete
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NikitolProject
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---
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phase: 03-round-trip-verification
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plan: 01
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subsystem: testing
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tags: [unit-tests, crypto, compression, format, hex-literal, aes-256-cbc, hmac-sha256, sha256, gzip]
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# Dependency graph
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requires:
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- phase: 02-core-archiver
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provides: "crypto.rs, compression.rs, format.rs modules with full pipeline"
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provides:
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- "Library crate (src/lib.rs) re-exporting all modules for integration tests"
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- "19 unit tests covering crypto, compression, and format serialization"
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- "Dev-dependencies: tempfile, assert_cmd, hex-literal, predicates"
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affects: [03-02, integration-tests, round-trip-verification]
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# Tech tracking
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tech-stack:
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added: [hex-literal 1.1, tempfile 3.26, assert_cmd 2.1, predicates 3.1]
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patterns: [library-crate-reexports, cfg-test-modules, hex-literal-for-known-values]
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key-files:
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created: [src/lib.rs]
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modified: [src/main.rs, src/crypto.rs, src/compression.rs, src/format.rs, Cargo.toml]
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key-decisions:
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- "Library crate with pub mod re-exports for all 6 modules (archive, cli, compression, crypto, format, key)"
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- "hex-literal v1.1 for compile-time hex byte arrays in SHA-256 test assertions"
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- "Unit tests embedded in modules via #[cfg(test)] mod tests blocks (not separate test files)"
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patterns-established:
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- "Library crate pattern: src/lib.rs re-exports, main.rs uses encrypted_archive:: imports"
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- "Test pattern: #[cfg(test)] mod tests with use super::* inside each module"
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- "SHA-256 verification against known values from FORMAT.md worked example"
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requirements-completed: [TST-03]
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# Metrics
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duration: 3min
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completed: 2026-02-24
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---
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# Phase 3 Plan 01: Library Crate and Unit Tests Summary
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**Library crate structure with 19 unit tests covering AES-256-CBC encrypt/decrypt, HMAC-SHA256, SHA-256, gzip compression, and format serialization round-trips**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-02-24T21:28:18Z
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- **Completed:** 2026-02-24T21:31:08Z
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- **Tasks:** 2
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- **Files modified:** 6
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## Accomplishments
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- Created library crate (src/lib.rs) enabling integration tests in tests/ directory for Plan 02
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- Added 19 unit tests across 3 modules all passing: crypto (6), compression (6), format (7)
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- Verified SHA-256 known values match FORMAT.md Section 12.3 worked example
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- Verified TOC entry size calculation matches FORMAT.md worked example (110 + 109 = 219 bytes)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create lib.rs, update main.rs imports, add dev-dependencies** - `ce9012c` (feat)
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2. **Task 2: Add unit tests to crypto.rs, compression.rs, and format.rs** - `3e96b1e` (test)
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## Files Created/Modified
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- `src/lib.rs` - Library crate re-exporting all 6 modules as public
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- `src/main.rs` - Updated to use `encrypted_archive::` imports instead of local mod declarations
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- `Cargo.toml` - Added dev-dependencies (tempfile, assert_cmd, hex-literal, predicates)
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- `src/crypto.rs` - 6 unit tests: encrypt/decrypt roundtrip, empty data, size formula, HMAC, SHA-256 known values
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- `src/compression.rs` - 6 unit tests: compress/decompress roundtrip, empty/large data, should_compress heuristic
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- `src/format.rs` - 7 unit tests: header roundtrip, TOC entry roundtrip (ASCII/Cyrillic/empty name), bad magic/version rejection, entry size calculation
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## Decisions Made
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- Used hex-literal v1.1 (latest) for compile-time hex byte arrays in SHA-256 assertions
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- Embedded tests in modules via #[cfg(test)] rather than separate test files (keeps tests close to implementation)
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- Library crate re-exports all 6 modules (archive, cli, compression, crypto, format, key) for maximum flexibility
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 3 - Blocking] Updated hex-literal version from 0.4 to 1.1**
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- **Found during:** Task 2 (adding unit tests)
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- **Issue:** Plan specified hex-literal 1.1 but initial Cargo.toml had 0.4; cargo resolved to 0.4.1 which is outdated
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- **Fix:** Updated Cargo.toml to hex-literal = "1.1" (latest stable)
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- **Files modified:** Cargo.toml
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- **Verification:** cargo build + cargo test pass
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- **Committed in:** 3e96b1e (Task 2 commit)
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---
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**Total deviations:** 1 auto-fixed (1 blocking)
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**Impact on plan:** Minor version correction, no scope change.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Library crate ready for integration tests in tests/ directory (Plan 02)
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- All pipeline modules have unit test coverage proving correctness
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- Dev-dependencies (tempfile, assert_cmd, predicates) ready for CLI round-trip tests
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## Self-Check: PASSED
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- All 6 key files exist on disk
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- Both task commits verified: ce9012c, 3e96b1e
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- cargo test: 19 passed, 0 failed
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---
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*Phase: 03-round-trip-verification*
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*Completed: 2026-02-24*
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