Summary

This chapter focused on testing Kotlin Flows in our Android project. We started by setting up the project for adding tests for the Flows. The coroutines testing library (kotlinx-coroutines-test) can help you in creating tests for coroutines and Flows.

We learned how to add tests for the Flows in your Android application. You can use a mock class that returns a Flow of values and then compare it with the returned values. You can also convert a Flow into List or Set, or take values from the Flow; you can then compare them with the expected values.

Then, we learned about testing hot Flows with Turbine, a third-party testing library for testing Kotlin Flows. Turbine has a test extension on Flow where you can consume and compare values one by one.

Finally, we worked on an exercise where we created tests for the Kotlin Flows in an existing Android project. We also used the Turbine testing library to make the writing of tests for Flows easier.

Throughout the book, we have...