createAndroidComposeRule<MainActivity>() launches the activity in the test process and verifies both app_name and app_tagline texts render on the placeholder screen. Uses JUnit 4 + AndroidJUnit4 runner - instrumented tests on Android still don't support JUnit Jupiter. Test compiles (assembleDebugAndroidTest passes); execution requires an emulator/device, performed in CI. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>