# createCommandTestHarness API

Functions from @purista/core

---
Canonical: /handbook/api/functions/_purista_core.createCommandTestHarness/
Source: testing/createCommandTestHarness.ts
Format: Markdown for agents
---

Package: `@purista/core`

## Signature

```typescript
createCommandTestHarness<TServiceBuilder, TCommandBuilder>(serviceBuilder: TServiceBuilder, commandBuilder: TCommandBuilder, options: CreateCommandTestHarnessOptions<TServiceBuilder>): Promise<{ destroy: () => Promise<void>; eventBridge: EventBridge; run: (input: { parameter: InferIn<InferCommandBuilderConfig<TCommandBuilder>["ParamsSchema"]>; payload: InferIn<InferCommandBuilderConfig<TCommandBuilder>["PayloadSchema"]> }) => Promise<{ message: unknown; result: unknown }>; service: Service<ServiceClassTypes<EmptyObject, EmptyObject>>; stubs: { eventBridge: Record<unknown, unknown> | undefined } }>
```