[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:652](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Worker.ts#L652)

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