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Merged
Chris-Wolfgang merged 2 commits into from
Sep 27, 2026
Merged

test(stryker): move stryker-config.json into the test project #378

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c8e1c15
test(stryker): move stryker-config.json into the test project (#281)
Chris-Wolfgang Sep 26, 2026
e70d2b2
Merge branch 'main' into test/stryker-config-in-test-project
Chris-Wolfgang Sep 26, 2026
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21 changes: 13 additions & 8 deletions docs/MUTATION-TESTING.md
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Expand Up @@ -12,13 +12,13 @@ not detect — an unenforced piece of behaviour.
`.github/workflows/stryker.yaml` runs Stryker on:

- **`pull_request`** targeting `main` or `vNext` (paths-filtered to
`src/`, `tests/`, `stryker-config.json`, and the workflow itself) —
`src/`, `tests/`, and the workflow itself) —
**this is the release gate**.
- Manual `workflow_dispatch`.
- Weekly Sunday 06:00 UTC (drift catch — external analyzers or SDK
updates can change the mutant set even with no code change).

`stryker-config.json` sets `thresholds.break` — the mutation score
`tests/Wolfgang.TryPattern.Tests.Unit/stryker-config.json` sets `thresholds.break` — the mutation score
percentage below which `dotnet stryker` itself exits non-zero. A PR
that regresses below the break threshold fails the workflow and blocks
merge.
Expand Down Expand Up @@ -54,12 +54,17 @@ justification comment.

```bash
dotnet tool install -g dotnet-stryker
dotnet stryker --config-file stryker-config.json
cd tests/Wolfgang.TryPattern.Tests.Unit
dotnet stryker
```

Report lands under `StrykerOutput/<timestamp>/reports/mutation-report.html`.
Run it **from the test project directory**, where it picks up
`stryker-config.json` automatically. Report lands under
`tests/Wolfgang.TryPattern.Tests.Unit/StrykerOutput/<timestamp>/reports/mutation-report.html`.

If Stryker crashes at initialisation with
`VisualBasicCommandLineParser` type-init errors, that is a known
Buildalyzer / Stryker 4.15 interaction issue on certain SDK
combinations. Run in CI to observe the score.
Do not run it from the repository root. With `TryPattern.sln` in the
working directory Stryker switches to solution mode and analyses every
project, including `examples/VB.*.vbproj`. Stryker's Buildalyzer ships an
older `Microsoft.CodeAnalysis.VisualBasic` than the .NET 10 SDK's Roslyn,
so the VB parser fails with `TypeLoadException: Roslyn.Utilities.IObjectWritable`
(stryker-mutator/stryker-net#3666, #281 here).
5 changes: 1 addition & 4 deletions stryker-config.json → ...TryPattern.Tests.Unit/stryker-config.json
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@@ -1,9 +1,6 @@
{
"stryker-config": {
"project": "src/Wolfgang.TryPattern/Wolfgang.TryPattern.csproj",
"test-projects": [
"tests/Wolfgang.TryPattern.Tests.Unit/Wolfgang.TryPattern.Tests.Unit.csproj"
],
"project": "Wolfgang.TryPattern.csproj",
"target-framework": "net10.0",
"reporters": [
"html",
Expand Down
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