Writing tests for your Paging Source

Writing tests for your implementations is crucial. We will write unit tests for our PagingSource implementation in this recipe to test our logic. Some tests that might be worth writing are checking when news Paging load failure happens.

We can also test the success state and more. You can follow the pattern to write tests for your project or use case.

Getting ready

To follow this recipe step by step, you need to have followed the Implementing the Jetpack Paging library recipe, and you need to use the PagingJetpackExample project.

How to do it…

Open PagingJetpackExample and follow along with this project to add unit tests:

1. Add the following testing libraries to your build.gradle app:

   testImplementation 'org.assertj:assertj-core:3.x.x'

   testImplementation "org.mockito:mockito-core:3.x.x"

   testImplementation 'Androidx.arch.core:core-testing:2.x.x'

   testImplementation 'org.jetbrains.kotlinx:kotlinx...