[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:396](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Worker.ts#L396)

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