Download the google-services.json file
from Firebase Console (for whatever Firebase project you
have or want to integrate the test-app) and store it under the current directory.
Note: The Package name for your app
created on the Firebase Console (for which the google-services.json is downloaded) must match
the applicationId declared in
the test-app/test-app.gradle.kts for the app to link to Firebase.
Run the test app directly from Android Studio by selecting and running
the firebase-config.test-app run configuration.