Jest module mock

If you use Jest for testing, you may need to mock the functionality of the native module. This library ships with a Jest mock that you can add to the setupFiles array in the Jest config.

By default, the mock behaves as if the calls were successful and returns mock user data.

"setupFiles": [
 "./node_modules/@react-native-google-signin/google-signin/jest/build/setup.js"
],