dataconnect: add gradle plugin that enables sharing code from src/test to src/androidTest

[dconeybe]

This PR introduces a new Gradle plugin that enables sharing test utilities between unit tests (src/test) and instrumentation tests (src/androidTest). It allows developers to annotate Kotlin files with @file:SharedWithAndroidTest, which the plugin will automatically copy into the androidTest generated sources directory during the build process.

Highlights

• Shared Test Utilities Plugin: Created a new Gradle plugin (com.google.firebase.dataconnect.sharedtest) to facilitate sharing code between unit and instrumentation tests.
• Code Generation Task: Implemented a CopySharedWithAndroidTestFiles task to recursively search for files annotated with @file:SharedWithAndroidTest and copy them to the androidTest source set.
• Custom Annotation: Added a @SharedWithAndroidTest annotation to mark source files intended for sharing across test environments.

Changelog

• firebase-dataconnect.gradle.kts
  • Applied the new com.google.firebase.dataconnect.sharedtest plugin.
• build.gradle.kts
  • Registered the com.google.firebase.dataconnect.sharedtest plugin.
• CopySharedWithAndroidTestFiles.kt
  • Added a Gradle task that copies files annotated with @file:SharedWithAndroidTest from the src/test directory to a generated androidTest directory.
• SharedWithAndroidTestPlugin.kt
  • Added the plugin implementation that registers the CopySharedWithAndroidTestFiles task and hooks it into the androidTest source sets.
• SharedWithAndroidTest.kt
  • Added the @SharedWithAndroidTest file-level annotation used to mark code to be shared.

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[dconeybe]

/gemini review

[github-actions]

📝 PRs merging into main branch

Our main branch should always be in a releasable state. If you are working on a larger change, or if you don't want this change to see the light of the day just yet, consider using a feature branch first, and only merge into the main branch when the code complete and ready to be released.

[gemini-code-assist]

Code Review

This pull request introduces a new Gradle plugin, com.google.firebase.dataconnect.sharedtest, designed to share test utilities between unit tests and Android instrumentation tests. It includes a custom Gradle task that identifies Kotlin files annotated with @file:SharedWithAndroidTest in the unit test source set and copies them to a generated source directory for androidTest. Review feedback suggests replacing a risky null assertion with a safer check in the plugin implementation, removing redundant manual directory cleanup logic handled automatically by Gradle's @OutputDirectory, and improving the robustness of the annotation detection logic to avoid false positives.

[dconeybe]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new Gradle plugin, com.google.firebase.dataconnect.sharedtest, which enables sharing test utilities between unit tests and Android instrumentation tests by copying annotated Kotlin files into the androidTest source set. The review feedback identifies two critical improvements for the CopySharedWithAndroidTestFiles task: using relative paths in generated headers to maintain Gradle build cache reproducibility and clearing the output directory before execution to prevent stale files from persisting when annotations are removed.

[dconeybe]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new Gradle plugin, com.google.firebase.dataconnect.sharedtest, designed to share test utilities between unit tests and Android instrumentation tests. It includes a custom Gradle task, CopySharedWithAndroidTestFiles, which scans for Kotlin files annotated with @file:SharedWithAndroidTest and copies them into the generated source sets for androidTest. Feedback suggests clearing the output directory before copying to avoid stale files and marking the input directory as optional to prevent build failures when the source directory is absent.