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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: ?

any solution?

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

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 issue.

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

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

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

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?

The problem is the package, in the video he creates the BrowseProjectsViewModel in the presentation package, and in the test, he creates a package called browse, which isn't the same and because of that the unit test are failing. You can either create the package browse in your project and add the view model classes in there, or just put the test in the root of the presentation.

>
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Lessons in Android Clean Architecture

1. Introduction to Clean Architecture
03:40
Joe Birch
GDE
2. Android and Clean Architecture
03:51
Joe Birch
GDE
3. Setting up a Multi-Module project
02:24
Joe Birch
GDE
4. Setting up the Domain layer module
02:24
Joe Birch
GDE
5. Creating the abstraction for our RxJava Observation Thread
02:02
Joe Birch
GDE
6. Setting up the Business Data for the Domain Layer
01:47
Joe Birch
GDE
7. Setting up the data access interface for the Domain Layer
01:49
Joe Birch
GDE
8. Setting up the Domain Layer Interactor classes
Pro
03:28
Joe Birch
GDE
9. Implementing the Get Projects use case
Pro
01:49
Joe Birch
GDE
10. Implementing the get Bookmarked Projects use case
Pro
01:33
Joe Birch
GDE
11. Implementing the Bookmark Project use case
Pro
01:57
Joe Birch
GDE
12. Implementing the UnBookmark Project use case (Domain layer 8)
Pro
02:03
Joe Birch
GDE
13. Testing the Get Projects use case
Pro
02:41
Joe Birch
GDE
14. Testing the Get Bookmarked Projects use case
Pro
02:04
Joe Birch
GDE
15. Testing the Bookmark Project use case
Pro
02:10
Joe Birch
GDE
16. Testing the UnBookmark Project use case
Pro
02:06
Joe Birch
GDE
17. Setting up the data module
Pro
02:17
Joe Birch
GDE
18. Creating the data models for the data layer
Pro
02:48
Joe Birch
GDE
19. Creating the external source interfaces for our data layer
Pro
02:24
Joe Birch
GDE
20. Creating the data layer store interface
Pro
01:19
Joe Birch
GDE
21. Creating the data layer cache data store
Pro
01:21
Joe Birch
GDE
22. Creating the data layer remote data store
Pro
01:39
Joe Birch
GDE
23. Creating the data store factory class
Pro
01:24
Joe Birch
GDE
24. Creating the central access point for the data layer
Pro
03:00
Joe Birch
GDE
25. Setting up the tests for the Data Layer
Pro
00:46
Joe Birch
GDE
26. Testing the data store factory class
Pro
01:39
Joe Birch
GDE
27. Testing the project entity mapper
Pro
01:18
Joe Birch
GDE
28. Testing the projects data repository
Pro
06:02
Joe Birch
GDE
29. Testing the projects cache data store
Pro
06:30
Joe Birch
GDE
30. Testing the projects remote data store
Pro
02:17
Joe Birch
GDE
31. Setting up the remote module
Pro
02:21
Joe Birch
GDE
32. Creating the data models for the remote layer
Pro
02:06
Joe Birch
GDE
33. Creating the Retrofit Service for the remote data source
Pro
01:58
Joe Birch
GDE
34. Creating the Retrofit Service Factory for the remote service interface
Pro
02:52
Joe Birch
GDE
35. Creating the data model mapper for the Remote Layer
Pro
01:59
Joe Birch
GDE
36. Creating the Remote Source implementation
Pro
01:55
Joe Birch
GDE
37. Setting up the Remote layer for testing
Pro
02:13
Joe Birch
GDE
38. Testing the remote model mapper class
Pro
01:39
Joe Birch
GDE
39. Testing the remote source implementation
Pro
05:09
Joe Birch
GDE
40. Setting up the Cache module
Pro
02:45
Joe Birch
GDE
41. Setting up the Cache layer data models
Pro
02:02
Joe Birch
GDE
42. Creating the database for the cache layer
Pro
01:34
Joe Birch
GDE
43. Creating the cached project Data Access Object
Pro
02:42
Joe Birch
GDE
44. Creating the Configuration Data Access Object
Pro
02:07
Joe Birch
GDE
45. Creating the cache model mapper
Pro
02:06
Joe Birch
GDE
46. Creating the Projects Cache data source Implementation
Pro
03:57
Joe Birch
GDE
47. Setting up the tests for our cache layer
Pro
01:17
Joe Birch
GDE
48. Testing the cached project model mapper
Pro
01:44
Joe Birch
GDE
49. Testing the Cached project DAO
Pro
04:33
Joe Birch
GDE
50. Testing the Configuration DAO
Pro
02:05
Joe Birch
GDE
51. Testing the projects cache implementation
Pro
05:48
Joe Birch
GDE
52. Setting up the presentation module
Pro
02:05
Joe Birch
GDE
53. Creating the data models for the presentation layer
Pro
01:13
Joe Birch
GDE
54. Creating the data model mapper for the presentation layer
Pro
01:26
Joe Birch
GDE
55. Creating the presentation state model
Pro
01:39
Joe Birch
GDE
56. Creating the browse projects view model
Pro
04:25
Joe Birch
GDE
57. Creating the bookmarked projects view model
Pro
03:05
Joe Birch
GDE
58. Setting up the presentation module tests
Pro
02:09
Joe Birch
GDE
59. Testing the view model mapper
Pro
01:17
Joe Birch
GDE
60. Testing our Browse Projects View Model implementation
Pro
04:36
Joe Birch
GDE
61. Testing our Browse Bookmarked Projects View Model implementation
Pro
04:34
Joe Birch
GDE
62. Setting up the UI module
Pro
02:22
Joe Birch
GDE
63. Creating the Post Execution Thread Implementation
Pro
01:26
Joe Birch
GDE
64. Setting up the application class
Pro
00:50
Joe Birch
GDE
65. Setting up the Dependency Injection for the UI module
Pro
02:46
Joe Birch
GDE
66. Creating the UI modules Project representation
Pro
00:50
Joe Birch
GDE
67. Creating the the Project model mapper for the UI module
Pro
01:24
Joe Birch
GDE
68. Setting up the Browse Projects Activity
Pro
01:08
Joe Birch
GDE
69. Configuring the DI for the project
Pro
04:37
Joe Birch
GDE
70. Creating the Project item view
Pro
01:51
Joe Birch
GDE
71. Creating the Browse Projects Adapter
Pro
03:27
Joe Birch
GDE
72. Creating the browse bookmarked projects adapter
Pro
03:54
Joe Birch
GDE
73. Creating the browse bookmarked projects activity
Pro
03:18
Joe Birch
GDE
74. Tying together the browse projects and bookmarked projects activity
Pro
02:30
Joe Birch
GDE
75. Setting up Unit Tests for the UI module
Pro
00:54
Joe Birch
GDE
76. Test the project model mapper
Pro
01:10
Joe Birch
GDE
77. Configuring the Dependency Injection for our User Interface tests
Pro
06:10
Joe Birch
GDE
78. Writing Espresso tests for the Browse Projects Activity
Pro
03:15
Joe Birch
GDE
79. Writing Espresso tests for the Bookmarked Projects Activity
Pro
02:34
Joe Birch
GDE
80. Simplifying the work we have done
Pro
05:14
Joe Birch
GDE