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

```ts
function testCreateRandomLib(seed?: string): Random;
```

Defined in: [packages/common/src/Random.ts:92](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Random.ts#L92)

Creates a seeded random number generator from the NPM `random` package for
deterministic tests.

Default seed "evolu".