Write unit test cases for Amplify Android SDK function (Auth)

Question

I want to write unit test cases for Amplify Android SDK for Auth functionality. I want to write unit test cases for below function.

Amplify.Auth.signIn()

Amplify.Auth.signUp()

Amplify.Auth.fetchAuthSession()

To write unit test cases for Amplify Android SDK function we need to init Amplify configuration like

Amplify.addPlugin()
Amplify.configure()

So, How to init Amplify configuration in unit test cases?

What is easy way to write unit test cases?