A few more things I noticed trying to run in the branch:

• GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS needs to be added to the Preprocessor Macros setting similar to how it is for the iOS Tests target
• The Test scheme should be marked shared and visible in the scheme editor and then the resulting file added to the repo
• Some extra cruft got into the HEADER_SEARCH_PATHS setting. Make it the same as the iOS test target.

There's conflict in the file, should I keep adding IID tests and merge later or just submit this CL first?

The conflict needs to be solved before merging. It looks feasible now after deintegrating. At a quick glance, it looks like "Accepting Both" for the one conflict will do it.

Also, the new test targets should be added to the "All tvOS" Aggregate target scheme and then they'll be included in CI.

Do git merge origin/master and git mergetool

Done merging the conflicts.

It doesn't let me merge by running git merge origin/master
So I did the step 1 of comment line instructions and push the change to this PR.

Looks like we need to update the FirebaseInstanceID version on SpecsStaging for FirebaseMessaging to pass pod lib lint.

To be safe, let's hold off on this until the M44 release branch gets made.