# TestRouter

Builds a deterministic in-memory Router Layer for tests.

## Signatures

```ts
export declare const TestRouter: (options: (MemoryOptions | InitialMemoryOptions) & {}) => Layer.Layer<Router, Cause.IllegalArgumentError | NavigationError>;
```



## Examples

```ts
import { TestRouter } from "@typed/router/RouterTest"
const RouterTest = TestRouter({ url: "/" })
```