# @repo/core-testing

Shared testing utilities. Tag: `tooling`. May be depended on by any package as a devDependency.

## Subpath exports

- `@repo/core-testing/factory` — `defineFactory<T>(builder)` for test data factories
- `@repo/core-testing/contract` — `defineContractSuite<T>(name, suite)` for cross-impl contract tests
- `@repo/core-testing/react` — `renderWithProviders`, `createMockTrpcClient`
- `@repo/core-testing/payload` — `stubPayloadConfig`, `mockPayloadModule`
- `@repo/core-testing/setup/jsdom` — vitest setupFile (jest-dom + cleanup)
- `@repo/core-testing/setup/node` — vitest setupFile (no-op placeholder)

## Adding a factory

```typescript
import { defineFactory } from "@repo/core-testing/factory";

export const articleFactory = defineFactory<Article>(({ sequence }) => ({
  id: `article-${sequence}`,
  title: `Article ${sequence}`,
  // stable defaults — overrides drive variation
}));
```

## Adding a contract suite

See `docs/guides/tdd-workflow.md` §"Contract suite usage".