[iOS] Fixes template build failed in release mode

[zhongwuzw]

Summary

Fixes #25745, Xcode stripped dead code in Release mode, and in template test code, it should only run in Debug mode, so we can use a macro to fix this issue.

Changelog

[iOS] [Fixed] - Fixes template build failed in release mode

Test Plan

1. Create a new project using react-native init AwesomProject.
2. Change project target scheme to Release.
3. Build and it should success.

[elicwhite]

Thanks for this. I wouldn’t have expected a tests file to cause the app to fail to build. Is that normal?

Also, would it make sense to validate that release builds build successfully in CI to keep this kind of issue from sneaking back in?

Should we also have a release scheme in the default template? I can’t imagine that anyone starts an RN project without wanting to build for release so they have to go through all those steps on their own.

[zhongwuzw]

Thanks for this. I wouldn’t have expected a tests file to cause the app to fail to build. Is that normal?

Yeah, we should avoid.

Also, would it make sense to validate that release builds build successfully in CI to keep this kind of issue from sneaking back in?

We don't use template project in main react-native's CI, I think only cli uses it, so more suitable for cli to add it in CI?

Should we also have a release scheme in the default template? I can’t imagine that anyone starts an RN project without wanting to build for release so they have to go through all those steps on their own.

Emm, we can left users to create, users don't use release mode to develop in most of the time, only when profile or publish app.

[elicwhite]

I can’t land this from my phone so I’ll land it on Monday at work if someone else hasn’t landed it already by then

[facebook-github-bot]

@TheSavior is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @zhongwuzw in 0fcaca8.

^{When will my fix make it into a release? | Upcoming Releases}

[mmazzarolo]

Applying this change to /ios/{appname}Tests/{appname}Tests.m fixes the issue.
Thanks!