AndroidX Test and Espresso

1. Testing overview

   Test types, local vs instrumented.

2. Espresso

   onView, ViewMatchers, ViewActions and ViewAssertions.

3. Local unit tests

   JUnit tests on the JVM and Robolectric.

4. Instrumented tests

   AndroidJUnitRunner and ActivityScenario.

5. UI Automator

   Cross-app UI testing.

6. Testing fundamentals

   Test pyramid and strategy.

7. Release notes

   Test artifact versions.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.