Should this be moved out into a function/helper?
I see we have the same code in the `setUp()` function, as well as another test (and in a few different files):

```bash
$ grep -ir "Math.random()" tests
```

1. tests/functional/change_password.js:      `email = 'signin' + Math.random() + '@example.com';`
1. tests/functional/change_password.js:      `email = 'signin' + Math.random() + '@example.com';`
1. tests/functional/complete_sign_up.js:      `user = 'signin' + Math.random();`
1. tests/functional/confirm.js:      `var email = 'signup' + Math.random() + '@example.com';`
1. tests/functional/force_auth.js:      `user = 'signin' + Math.random();`
1. tests/functional/reset_password.js:      `user = 'signin' + Math.random();`
1. tests/functional/reset_password.js:      `user = 'signin' + Math.random();`
1. tests/functional/reset_password.js:      `email = 'signin' + Math.random() + '@restmail.net';`
1. tests/functional/reset_password.js:      `var user = 'signin' + Math.random();`
1. tests/functional/settings.js:      `email = 'signin' + Math.random() + '@example.com';`
1. tests/functional/sign_in.js:      `user = 'signin' + Math.random();`
1. tests/functional/sign_up.js:      `var email = 'signup' + Math.random() + '@example.com';`
1. tests/functional/sign_up.js:      `var email = 'signup' + Math.random() + '@example.com';`
1. tests/functional/sign_up.js:      `var email = 'signup' + Math.random() + '@example.com';`
1. tests/functional/sign_up.js:      `var email = 'signup' + Math.random() + '@example.com';`
1. tests/functional/sign_up.js:      `var email = 'signup' + Math.random() + '@example.com';`