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Please add a cache relocateability test for the safe args plugin in AndroidX.

To test this, add a test for a project which uses the safe args plugin and ensure that the compile tasks, safe args plugin tasks, and other dependent resource tasks are relocated between builds.

More information:
We want to be sure that the Android Gradle Plugin has full coverage for cache relocatability going forward. We noticed there there were a few missing cases in test coverage for cache relocatability. It is important that tasks produce stable outputs that are relocatable between builds so that users can benefit from caching and remote caching.

Cache relocatability is explained here:
https://guides.gradle.org/using-build-cache/#relocatability

Here are some resources/examples to help write these tests:

This example test relocation using a real world project: https://github.com/gradle/android-relocation-test

This example creates a configurable small sample project to test relocatability: https://github.com/gradle/android-cache-fix-gradle-plugin/blob/master/src/test/groovy/org/gradle/android/CrossVersionOutcomeAndRelocationTest.groovy 

Here are the cache relocatability tests in the Android Gradle plugin:
https://android.googlesource.com/platform/tools/base/+/mirror-goog-studio-master-dev/build-system/integration-test/application/src/test/java/com/android/build/gradle/integration/cacheability