Recipe idea: Stateful factory as a good pattern

It's too easy for integration test to step on each other toes by adding identical records when there is a unique constraint. For example, test 11 tries to add the user {name: 'messi'}, but also test 47 adds the same user. One of them will fail because 'name' is unique.

**Solution 1, what I used by now - Each test add a timestamp:**

`
const userToAdd = {name: `messi ${Math.random()}`)
`

**Solution 2, use a stateful factory - The test just calls some factory that manages the state and always provides fresh records:**
`
dataFactory.getUser('messi')//returns 'messi-55', or any unique number
`

A better approach might be to use some factory lib like rosie:
https://www.npmjs.com/package/rosie

Which one is better?

[Based on comments from @mikicho]