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Simplifying Android Development with Coroutines and Flows

You're reading from   Simplifying Android Development with Coroutines and Flows Learn how to use Kotlin coroutines and the flow API to handle data streams asynchronously in your Android app

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Product type Paperback
Published in Jul 2022
Publisher Packt
ISBN-13 9781801816243
Length 164 pages
Edition 1st Edition
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Author (1):
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Jomar Tigcal Jomar Tigcal
Author Profile Icon Jomar Tigcal
Jomar Tigcal
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Table of Contents (11) Chapters Close

Preface 1. Part 1 – Kotlin Coroutines on Android
2. Chapter 1: Introduction to Asynchronous Programming in Android FREE CHAPTER 3. Chapter 2: Understanding Kotlin Coroutines 4. Chapter 3: Handling Coroutine Cancelations and Exceptions 5. Chapter 4: Testing Kotlin Coroutines 6. Part 2 – Kotlin Flows on Android
7. Chapter 5: Using Kotlin Flows 8. Chapter 6: Handling Flow Cancelations and Exceptions 9. Chapter 7: Testing Kotlin Flows 10. Other Books You May Enjoy

Testing Kotlin Flows

In this section, we will focus on testing Kotlin Flows. We can create unit and integration tests for classes such as ViewModel that use Flow in their code.

To test code that collects a Flow, you can use a mock object that can return values which you can do assertion checks. For example, if your ViewModel listens to the Flow from a repository, you can create a custom Repository class that emits a Flow with a predefined set of values for easier testing.

For example, say you have a MovieViewModel class such as the following that has a fetchMovies function that collects a Flow:

class MovieViewModel(private val movieRepository:
  MovieRepository) {
    ...
    suspend fun fetchMovies() {
        movieRepository.fetchMovies().collect {
            _movies.value = it
     ...
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