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Reachability Fixture Harness
This directory carries the reachbench fixture packs used by Sprint 201 to validate reachability explainability.
fixtures/reachbench-2025-expanded/contains 24 multi-language cases with reachable and unreachable variants, SBOMs, callgraphs, runtime traces, and DSSE envelopes. Each variant ships a manifest with SHA-256 hashes to keep runs deterministic.StellaOps.Reachability.FixtureTestsprovides guard rails that ensure files exist, hashes match manifests, and ground-truth paths align with reachable/unreachable variants before the Signals/Scanner reachability pipeline consumes them.
Running the fixture tests
# From the repo root
DOTNET_CLI_UI_LANGUAGE=en DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1 \
dotnet test tests/reachability/StellaOps.Reachability.FixtureTests/StellaOps.Reachability.FixtureTests.csproj
# Focus only the evaluation harness checks
DOTNET_CLI_UI_LANGUAGE=en DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1 \
dotnet test tests/reachability/StellaOps.Reachability.FixtureTests/StellaOps.Reachability.FixtureTests.csproj \
--filter ReachbenchEvaluationHarnessTests
The tests validate fixture integrity (hashes, schema versions) and now enforce the evaluation harness contract: reachable variants must surface execution paths while unreachable variants must not. Keep the environment overrides above in CI to avoid localization drift during hash comparisons.