We have learned how to create an app based on RecyclerView in Chapter 9, Creating an Application, so we can just run through the concept of this app. We have a user data class with the ID and username. We will insert 100 users in the database and show in a custom RecyclerView. We also use a UserItemAdapter to customize the RecyclerView.

Clone this project if you want: https://github.com/PacktPublishing/Learn-Spring-for-Android-Application-Development/tree/master/Chapter10/TestingWithEspresso.

In this project, you find the MainActivity.kt where you can find a list view. Here is a piece of code from this class:

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 userLists.adapter = UserItemAdapter(this, userList)
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Here, the userLists is the RecyclerView and we have the UserItemAdapter custom adapter of a UserModel. Here, the UserModel code is where we take the ID and name of a user:

data class User(var userID: Int, var username: String)

Now, we will test this list view using Espresso with some major functions that are frequently used in our projects.