Unit testing suspending functions

In this section, we will focus on how you can unit test your suspending functions. You can create unit tests for classes such as ViewModel that launch a coroutine or have suspending functions.

Creating a unit test for a suspending function is more difficult to write as a suspending function can only be called from a coroutine or another coroutine. What you can do is use the runBlocking coroutine builder and call the suspending function from there. For example, say you have a MovieRepository class like the following:

class MovieRepository (private val movieService:

  MovieService) {

    ...

    private val movieLiveData =

      MutableLiveData<List<Movie>>()

    fun fetchMovies() {

        ...

        val movies = movieService.getMovies...