Android Testing

This one walks you through the testing pyramid for modern Android apps: unit tests for ViewModels and repositories, Hilt integration tests for DAOs and network layers, and screenshot tests using Roborazzi. The Roborazzi setup is the standout here since it runs on the JVM instead of requiring an emulator, which makes UI regression testing actually fast enough to run regularly. You get the full dependency list for libs.versions.toml, concrete examples with Compose test rules, and the Gradle commands to record and verify screenshots. Use this when you're setting up testing infrastructure on a greenfield project or finally adding proper coverage to that app that only has a few token unit tests.