# Deterministic Replayability for Tests

## Module
Cli

## Status
IMPLEMENTED

## Description
Test infrastructure includes determinism manifests, run manifest validation, test run attestation generation, and golden output replay verification, supporting the advisory's call for deterministic replayability.

## Implementation Details
- **Replay Infrastructure**: `src/Cli/StellaOps.Cli/Replay/` -- replay command and manifest handling
- **Determinism Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/Determinism/CliDeterminismTests.cs`, `AttestVerifyDeterminismTests.cs`
- **Golden Output Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/GoldenOutput/DeterminismReplayGoldenTests.cs`
- **Run Manifest**: `src/Cli/__Tests/StellaOps.Cli.Tests/Replay/RunManifestSerializerTests.cs` -- run manifest serialization
- **Determinism Harness**: `src/Cli/StellaOps.Cli/Services/DeterminismHarness.cs` / `IDeterminismHarness.cs`
- **Architecture**:
  - Run manifests capture all inputs (hashes, versions, timestamps) for reproducible execution
  - Golden output tests verify byte-identical output from identical inputs
  - Determinism harness wraps execution with purity checks

## E2E Test Plan
- [ ] Verify determinism tests pass with identical outputs across runs
- [ ] Verify run manifests capture all input hashes
- [ ] Verify golden output replay produces byte-identical results
- [ ] Verify determinism harness detects non-deterministic behavior
- [ ] Verify run manifest serialization round-trips correctly
- [ ] Verify attestation generation for test runs