If we do not use this, we will get the RuntimeException related to Looper in Android. Here we have used the InstantTaskExecutorRule which is needed to test code with LiveData. As you can see below, the ViewModel uses Kotlin Coroutines and (MockitoJUnitRunner :: class ) class SingleNetworkCallViewModelTest The SingleNetworkCallViewModel, then asks the data layer for the list of users using the ApiHelper. We will take the example of SingleNetworkCallViewModel which is present in the project.īasically, this SingleNetworkCallViewModel is a ViewModel that is associated with SingleNetworkCallActivity which triggers the ViewModel to fetch the list of users to render into the UI. You can find the complete code for unit testing mentioned in the blog in the project itself. The project follows a basic MVVM Architecture for simplicity. If you have not gone through the project, you should go through it and then come back.

I will be using this project for the implementation part.

We will write the unit-test for the ViewModel which makes a network call and then, validate if our ViewModel is working as expected or not. In this blog, we are going to learn how to write the unit test for ViewModel with Kotlin Coroutines and LiveData that follows a basic MVVM Architecture. I am Amit Shekhar, a mentor helping developers in getting high-paying tech jobs.īefore we start, I would like to mention that, I have released a video playlist to help you crack the Android Interview: Check out Android Interview Questions and Answers.

Mockito with kotlin