What if we do something like that:

```ruby
allow(config).to receive(:rspec_mocks_loaded?).and_return(false, true)
```

So it will return `false` once and afterwards will return `true`.

We can do this in more honest way:

1. stub `rspec_mocks_loaded?` to return `false`
2. stub `config#mock_with` with custom block which will unstub `rspec_mocks_loaded?` or stub it with `true`