How to use in a UITest

### New Issue Checklist

- [ x] I have tried with the latest version of OHHTTPStubs
- [x ] I have read the [README](https://github.com/AliSoftware/OHHTTPStubs/blob/master/README.md)
- [x ] I have read the [Using the right Swift Version of `OHHTTPStubs` for your project](https://github.com/AliSoftware/OHHTTPStubs#using-the-right-swift-version-of-ohhttpstubs-for-your-project) section
- [ x] I have searched in the [existing issues](https://github.com/AliSoftware/OHHTTPStubs/issues?utf8=✓&q=is%3Aissue)
- [x ] I have read [the OHHTTPStubs wiki](https://github.com/AliSoftware/OHHTTPStubs/wiki) to see if there wasn't a detailed page talking about my issue

### Environment

- version of OHHTTPStubs: 9.1.0
-
- integration method you are using:
* [ ] Cocoapods
* [ ] Carthage
* [ ] submodule
* [ x] other: SPM
- version of the tool you use: Xcode 12.5

### Issue Description

I am using OHHTTPStubs in my Units tests without any issue.
For my unit tests target I have my main app selected as the host application.
I have OHHTPStubs added under link with libraries for the unit testing target.

For my UITest target I have my main app selected as the target app.
I have also added OHHTPStubs under link with libraries for the UI testing target.

I am able to import OHHTTPStubs in to my UITest files and can add code to stub out requests. But when I run a UITest the stub blocks are never called.

I do not have OHHTTPStubs added under link with libraries for my main app.

I have seen this guide but not sure if it applies to my issue [A tricky case with Application Tests](https://github.com/AliSoftware/OHHTTPStubs/wiki/A-tricky-case-with-Application-Tests)

I think the setup I have is applying the stubs only to my UITesting app, and not the main app.

Any help would be appreciated thanks.