Dive into a technical session from Google I/O 2017 focusing on test-driven development for Android using the Android Testing Support Library (ATSL). Explore the official testing library's features and recent enhancements designed to simplify high-quality Android app development. Learn how ATSL enables test-driven, rapid iterative development cycles as part of a comprehensive automated testing strategy. Gain insights into the testing pyramid, refactoring techniques, and unit test characteristics. Discover Robolectric for unit testing, level testing, and the Android Test Orchestrator. Understand the benefits of multiprocess Espresso for UI testing. Led by Android experts Stephan Linzner, Nick Korostelev, Jonathan Gerrish, and Christian Williams, this 40-minute talk provides valuable knowledge for Android developers looking to improve their testing practices.