In the last chapter, you refactored WeWatch to use the View-Interactor-Presenter-Entity-Router (better know as VIPER) architecture pattern. In this chapter, you’ll learn how to test your VIPER architecture by creating unit tests and mocking classes using Mockito.
Getting started
Start by opening the starter project and selecting the app build.gradle from the project.
Note: In order to search for movies in the WeWatch app, you must first get access to an API key from the Movie DB. To get your API own key, sign up for an account at www.themoviedb.org. Then, navigate to your account settings on the website, view your settings for the API, and register for a developer API key. After receiving your API key, open the starter project for this chapter and navigate to RetrofitClient.kt. There, you can replace the existing value for API_KEY with your own.
After the starter project finishes loading and building, run the app on a device or emulator and try adding a new movie by tapping the + float action button.
Type in a title and press the icon to the right to search for a movie.
Nothing shows up, indicating there’s some kind of problem.
At this point, it’s unclear whether there’s an issue with the search function or the TMDB API. Try adding a movie manually using Add Movie. Notice the main screen is still empty.
Something is clearly wrong — and thanks to unit testing, you’ll be able to find out what it is by creating unit tests for each of your Presenters.
Testing your Main presenter
For this project, you’ll use Mockito to mock the necessary dependencies for your app, and you’ll use JUnit to perform the tests.
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