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Android Clean Architecture

Testing our Browse Projects View Model implementation

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In this lesson we're going to be writing a unit test class for our Browse Projects View Model class to ensure that it operates as expected.

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java.lang.IllegalStateException: A wildcard does not represent an erasable type: ?

Same issue.

any solution?

After a few hours of searching, I found the solution. In the domain module, make sure that the GetProjects and GetBookmarkedProjects use cases extend ObservableUseCase<List<Project>, Nothing?>

Nothing -> Nothing?

That should fix the problem! :)

Same comment as below: I can't see this from my side, even when pulling the code from the Repo fresh. What version of AS are you running? Does this happen when running both from the IDE and the command line?

here is the logs - https://gist.github.com/dmersiyanov/bed1a0de3d55628ad55583d1ff77698a

I'm getting the same error. And when I run Joe's latest code all 5 of his unit tests fail with:

java.lang.RuntimeException: Method getMainLooper in android.os.Looper not mocked

There is another easier fix that I can't find because the solution code runs fine. My fix was to set the mainThread as Scheduler.trampoline()

  1. Change the projectViewModel as a lateinit var
    private lateinit var projectViewModel: BrowseProjectsViewModel

  2. Add a setup function that sets the main thread as Scheduler.trampoline() and initialize the projectViewModel
    @Before
    fun setup() {
    RxAndroidPlugins.setInitMainThreadSchedulerHandler {
    _ -> Schedulers.trampoline()
    }
    projectViewModel = BrowseProjectsViewModel(getProjects, bookmarkProject, unbookmarkProject, projectMapper)
    }

Note: It's also important that instantTaskExecutorRule is not private

I can't see this from my side, even when pulling the code from the Repo fresh. What version of AS are you running? Does this happen when running both from the IDE and the command line?

I'm running AS 3.2 Beta 5, but I just tested it in AS 3.1.3 as well and got the same error. If I to as instructed in the error message, add

android {
// ...
testOptions {
unitTests.returnDefaultValues = true
}
}

then the unit test (fetchProjectsExecutesUseCase, I'm still just trying to get the first unit test to pass) fails because it executes twice instead of once.

It's supposed to execute twice if you have the init block in the view models. Just update the tests to reflect that

Joe can you troubleshoot my code? I've created a repo with the error. You can find it here: https://github.com/szaske/GithubTrend/tree/unit-bug

Watching your repo)

Since argumentcaptor doesn't do any type checks from what i've read from the docs.. is it reading the ( ? ) as a wildcard type instead; which relates to the Type system or Generics with Java ?>

Also i look into the error logs.. ...
java.lang.IllegalStateException: A wildcard does not represent an erasable type: ?
at net.bytebuddy.description.type.TypeDescription$Generic$OfWildcardType.asErasure(TypeDescription.java:3849)

  • if we look into this class, its about verifying generics in Java.

and there's barely any resource to help us with this issue written in kotlin.. Maybe i think we need to write an abstract base class in java to overcome this by writing our own base class to avoid this misunderstanding at a low level.. LOL :)

Hey Joe.
All my tests are getting the same errors as Steve Zaske.
I copied all your source code from lesson 1 to this lesson (60th).
So, could you help me here?

>
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Lessons in Android Clean Architecture

Introduction to Clean Architecture
03:40
Joe Birch
GDE
Android and Clean Architecture
03:51
Joe Birch
GDE
Setting up a Multi-Module project
02:24
Joe Birch
GDE
Setting up the Domain layer module
02:24
Joe Birch
GDE
Creating the abstraction for our RxJava Observation Thread
02:02
Joe Birch
GDE
Setting up the Business Data for the Domain Layer
01:47
Joe Birch
GDE
Setting up the data access interface for the Domain Layer
01:49
Joe Birch
GDE
Setting up the Domain Layer Interactor classes
Pro
03:28
Joe Birch
GDE
Implementing the Get Projects use case
Pro
01:49
Joe Birch
GDE
Implementing the get Bookmarked Projects use case
Pro
01:33
Joe Birch
GDE
Implementing the Bookmark Project use case
Pro
01:57
Joe Birch
GDE
Implementing the UnBookmark Project use case (Domain layer 8)
Pro
02:03
Joe Birch
GDE
Testing the Get Projects use case
Pro
02:41
Joe Birch
GDE
Testing the Get Bookmarked Projects use case
Pro
02:04
Joe Birch
GDE
Testing the Bookmark Project use case
Pro
02:10
Joe Birch
GDE
Testing the UnBookmark Project use case
Pro
02:06
Joe Birch
GDE
Setting up the data module
Pro
02:17
Joe Birch
GDE
Creating the data models for the data layer
Pro
02:48
Joe Birch
GDE
Creating the external source interfaces for our data layer
Pro
02:24
Joe Birch
GDE
Creating the data layer store interface
Pro
01:19
Joe Birch
GDE
Creating the data layer cache data store
Pro
01:21
Joe Birch
GDE
Creating the data layer remote data store
Pro
01:39
Joe Birch
GDE
Creating the data store factory class
Pro
01:24
Joe Birch
GDE
Creating the central access point for the data layer
Pro
03:00
Joe Birch
GDE
Setting up the tests for the Data Layer
Pro
00:46
Joe Birch
GDE
Testing the data store factory class
Pro
01:39
Joe Birch
GDE
Testing the project entity mapper
Pro
01:18
Joe Birch
GDE
Testing the projects data repository
Pro
06:02
Joe Birch
GDE
Testing the projects cache data store
Pro
06:30
Joe Birch
GDE
Testing the projects remote data store
Pro
02:17
Joe Birch
GDE
Setting up the remote module
Pro
02:21
Joe Birch
GDE
Creating the data models for the remote layer
Pro
02:06
Joe Birch
GDE
Creating the Retrofit Service for the remote data source
Pro
01:58
Joe Birch
GDE
Creating the Retrofit Service Factory for the remote service interface
Pro
02:52
Joe Birch
GDE
Creating the data model mapper for the Remote Layer
Pro
01:59
Joe Birch
GDE
Creating the Remote Source implementation
Pro
01:55
Joe Birch
GDE
Setting up the Remote layer for testing
Pro
02:13
Joe Birch
GDE
Testing the remote model mapper class
Pro
01:39
Joe Birch
GDE
Testing the remote source implementation
Pro
05:09
Joe Birch
GDE
Setting up the Cache module
Pro
02:45
Joe Birch
GDE
Setting up the Cache layer data models
Pro
02:02
Joe Birch
GDE
Creating the database for the cache layer
Pro
01:34
Joe Birch
GDE
Creating the cached project Data Access Object
Pro
02:42
Joe Birch
GDE
Creating the Configuration Data Access Object
Pro
02:07
Joe Birch
GDE
Creating the cache model mapper
Pro
02:06
Joe Birch
GDE
Creating the Projects Cache data source Implementation
Pro
03:57
Joe Birch
GDE
Setting up the tests for our cache layer
Pro
01:17
Joe Birch
GDE
Testing the cached project model mapper
Pro
01:44
Joe Birch
GDE
Testing the Cached project DAO
Pro
04:33
Joe Birch
GDE
Testing the Configuration DAO
Pro
02:05
Joe Birch
GDE
Testing the projects cache implementation
Pro
05:48
Joe Birch
GDE
Setting up the presentation module
Pro
02:05
Joe Birch
GDE
Creating the data models for the presentation layer
Pro
01:13
Joe Birch
GDE
Creating the data model mapper for the presentation layer
Pro
01:26
Joe Birch
GDE
Creating the presentation state model
Pro
01:39
Joe Birch
GDE
Creating the browse projects view model
Pro
04:25
Joe Birch
GDE
Creating the bookmarked projects view model
Pro
03:05
Joe Birch
GDE
Setting up the presentation module tests
Pro
02:09
Joe Birch
GDE
Testing the view model mapper
Pro
01:17
Joe Birch
GDE
Testing our Browse Projects View Model implementation
Pro
04:36
Joe Birch
GDE
Testing our Browse Bookmarked Projects View Model implementation
Pro
04:34
Joe Birch
GDE
Setting up the UI module
Pro
02:22
Joe Birch
GDE
Creating the Post Execution Thread Implementation
Pro
01:26
Joe Birch
GDE
Setting up the application class
Pro
00:50
Joe Birch
GDE
Setting up the Dependency Injection for the UI module
Pro
02:46
Joe Birch
GDE
Creating the UI modules Project representation
Pro
00:50
Joe Birch
GDE
Creating the the Project model mapper for the UI module
Pro
01:24
Joe Birch
GDE
Setting up the Browse Projects Activity
Pro
01:08
Joe Birch
GDE
Configuring the DI for the project
Pro
04:37
Joe Birch
GDE
Creating the Project item view
Pro
01:51
Joe Birch
GDE
Creating the Browse Projects Adapter
Pro
03:27
Joe Birch
GDE
Creating the browse bookmarked projects adapter
Pro
03:54
Joe Birch
GDE
Creating the browse bookmarked projects activity
Pro
03:18
Joe Birch
GDE
Tying together the browse projects and bookmarked projects activity
Pro
02:30
Joe Birch
GDE
Setting up Unit Tests for the UI module
Pro
00:54
Joe Birch
GDE
Test the project model mapper
Pro
01:10
Joe Birch
GDE
Configuring the Dependency Injection for our User Interface tests
Pro
06:10
Joe Birch
GDE
Writing Espresso tests for the Browse Projects Activity
Pro
03:15
Joe Birch
GDE
Writing Espresso tests for the Bookmarked Projects Activity
Pro
02:34
Joe Birch
GDE
Simplifying the work we have done
Pro
05:14
Joe Birch
GDE