If you are new to Espresso, try this sample first.

This project uses the Gradle build system. You don't need an IDE to build and execute it but Android Studio 3.4 is recommended.

1. Download the project code, preferably using git clone.
2. In Android Studio, select File | Open... and point to the ./build.gradle file.
3. Check out the relevant code:
   • The application under test is located in src/main/java
   • Instrumentation Tests are in src/androidTest/java
   • Local Tests are in src/test/java
4. Create and run the Instrumented test configuration
   • Open Run menu | Edit Configurations
   • Add a new Android Instrumented Tests configuration
   • Choose the app module
   • Connect a device or start an emulator
   • Turn animations off. (On your device, under Settings->Developer options disable the following 3 settings: "Window animation scale", "Transition animation scale" and "Animator duration scale")
   • Run the newly created configuration
   • The application will be started on the device/emulator and a series of actions will be performed automatically.
5. Create and run the local Test configuration
   • Open Run menu | Edit Configurations
   • Add a new *Android JUnit * configuration
   • Set Use classpath of module to app
   • Set Class to ChangeTextBehaviorLocalTest
   • Run the configuration
   • The test will run on local host

If you are using Android Studio, the Run window will show the test results.