[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Worker](https://evolu.dev/docs/api-reference/common/Worker) › testCreateMessagePort

```ts
const testCreateMessagePort: CreateMessagePort;
```

Defined in: [packages/common/src/Worker.ts:576](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Worker.ts#L576)

Creates an in-memory [CreateMessagePort](https://evolu.dev/docs/api-reference/common/Worker/type-aliases/CreateMessagePort) for testing.