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cscheck

Write and simplify C# property-based, model-based, and executable specification tests with CsCheck. Use for generators, shrinking, stateful command sequences, Spec guards and rules, implementation conformance, or replaying generated failures.

skills/cscheck/SKILL.md

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# CsCheck

Use CsCheck to explore inputs and action sequences; keep the application's contract visible in the test.
Let the library generate, shrink, print, and replay counterexamples. Start with the smallest test that
can falsify the claim, rather than building a testing framework around CsCheck.

## Choose the test shape

| What needs checking | Start with | Read when needed |
| --- | --- | --- |
| A function, round trip, algebraic law, or data transformation | `Gen` + `Sample` | [Properties and generators](references/properties.md) |
| An implementation with a simpler reference representation | `SampleModelBased` / `SampleModelBasedAsync` | [Stateful and async tests](references/stateful-and-async.md) |
| A protocol or lifecycle with explicit state, guards, and requirements | `Spec.From`, then `Exhaustive` and `Conform` | [Executable specifications](references/specifications.md) |
| Async resources or expectations that must incorporate observed outcomes | Generated command arrays + `SampleAsync`, with cleanup inside each case | [Stateful and async tests](references/stateful-and-async.md) |