# Fixture Harvester Tool (Deterministic Fixture Rewriter)

## Module
Tools

## Status
VERIFIED

## Description
CLI tool for deterministic test fixture management. Rewrites Concelier OSV/GHSA/NVD fixtures with SHA-256-based deterministic GUIDs and fixed timestamps, ensuring reproducible test data across environments.

## Implementation Details
- **Fixture Updater App**: `src/Tools/FixtureUpdater/FixtureUpdaterApp.cs` (96 lines) -- CLI entry point using `System.CommandLine`. Parses `--repo-root`, `--osv-fixtures`, `--ghsa-fixtures`, `--nvd-fixtures`, `--fixed-time` options. Resolves repository root and fixture paths, constructs `FixtureUpdaterOptions`, dispatches to runner.
- **Fixture Updater Runner**: `src/Tools/FixtureUpdater/FixtureUpdaterRunner.cs` (533 lines) -- core execution engine: processes OSV raw fixtures (JSON arrays of `OsvVulnerabilityDto`), generates deterministic snapshot fixtures for npm/PyPI ecosystems, processes GHSA raw fixtures (`GhsaRecordDto`), generates credit parity regression fixtures across GHSA/OSV/NVD sources. Uses `FixtureDeterminism` class for SHA-256-based deterministic GUID generation.
- **Program.cs**: `src/Tools/FixtureUpdater/Program.cs` (3 lines) -- delegates to `FixtureUpdaterApp.RunAsync(args)`.

## E2E Test Plan
- [x] Run the fixture updater tool twice with the same inputs and verify outputs are bit-for-bit identical (determinism check)
- [x] Verify error reporting includes context about which fixture source caused the failure

## Verification
- **Verified**: 2026-02-10
- **Method**: Tier 1 code review + Tier 2d test verification
- **Build**: Passes (0 errors, 0 warnings)
- **Tests**: 2 tests pass (determinism verification, error reporting with context)
- **Caveat**: Original feature description overstated capabilities. The tool does NOT implement harvest/validate/regen sub-commands, YAML manifests with schema versioning, tiered fixtures (Synthetic/Spec Examples/Real Samples/Regression), or configurable refresh policies. The actual tool is a deterministic OSV/GHSA/NVD fixture rewriter using SHA-256 hashing and fixed timestamps. Feature title and description updated to reflect actual implementation.

## Recheck (Run-002)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (`src/Tools/__Tests/FixtureUpdater.Tests`: 2/2).
- **Tier 2 Evidence**: `docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-002/tier2-integration-check.json`
- **Outcome**: Deterministic fixture rewrite and contextual error reporting behavior remain stable.


## Recheck (Run-003)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (`src/Tools/__Tests/FixtureUpdater.Tests`: 2/2).
- **Tier 2 Evidence**: `docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-003/tier2-integration-check.json`
- **Outcome**: Deterministic fixture rewrite and contextual error reporting behavior remain stable.

## Recheck (Run-004)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (FixtureUpdater 2/2).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-004/tier2-integration-check.json
- **Outcome**: Checked Tools behavior remains healthy in follow-up replay.

## Recheck (Run-005)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (FixtureUpdater 2/2).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-005/tier2-integration-check.json
- **Outcome**: Checked Tools behavior remains healthy in continued replay.

## Recheck (Run-006)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (FixtureUpdater 2/2).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-006/tier2-integration-check.json
- **Outcome**: Checked Tools behavior remains healthy in continued replay.

## Recheck (Run-007)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (FixtureUpdater 2/2).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-007/tier2-integration-check.json
- **Outcome**: Checked Tools behavior remains healthy in continued replay.

## Recheck (Run-008)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (FixtureUpdater 2/2).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-008/tier2-integration-check.json
- **Outcome**: Checked Tools behavior remains healthy in continued replay.


## Recheck (Run-009)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (WorkflowGenerator 76/76, FixtureUpdater 2/2, GoldenPairs 9/9; total 87/87).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-009/tier2-integration-check.json
- **Outcome**: Checked tools behavior remains healthy in continued replay.
## Recheck (Run-010)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (WorkflowGenerator 76/76, FixtureUpdater 2/2, GoldenPairs 9/9; total 87/87).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-010/tier2-integration-check.json
- **Outcome**: Checked tools behavior remains healthy in continued replay.
## Recheck (Run-011)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (WorkflowGenerator 76/76, FixtureUpdater 2/2, GoldenPairs 9/9; total 87/87).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-011/tier2-integration-check.json
- **Outcome**: Checked tools behavior remains healthy in continued replay.
## Recheck (Run-012)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic tools suite replay.
- **Tests**: PASS (WorkflowGenerator 76/76, FixtureUpdater 2/2, GoldenPairs 9/9; total 87/87).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-012/tier2-integration-check.json
- **Outcome**: Checked tools behavior remains healthy in continued replay.

## Recheck (Run-013)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay with fresh command-output evidence.
- **Tests**: PASS (2/2; Tools matrix 87/87: WorkflowGenerator 76, FixtureUpdater 2, GoldenPairs 9.)
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-013/tier2-integration-check.json
- **Outcome**: Checked Tools behavior remains healthy in continued replay.

## Recheck (Run-014)
- **Verified**: 2026-02-11
- **Method**: Strict Tier 2 CLI replay with positive and negative command paths.
- **Tests**: PASS (`src/Tools/__Tests/FixtureUpdater.Tests`: 4/4).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/tools/fixture-harvester-tool/run-014/tier2-cli-check.json
- **Outcome**: Deterministic fixture rewrite behavior and invalid-argument error handling verified via end-user CLI commands.