Hilt Fragments must be attached to an @AndroidEntryPoint Activity. Found: class androidx.fragment.app.testing.FragmentScenario$EmptyFragmentActivity

Question

I got following error when i run my unit test code.

Caused by: java.lang.IllegalStateException: Hilt Fragments must be attached to an @AndroidEntryPoint Activity. Found: class androidx.fragment.app.testing.FragmentScenario$EmptyFragmentActivity
at dagger.hilt.internal.Preconditions.checkState(Preconditions.java:83)
at dagger.hilt.android.internal.managers.FragmentComponentManager.createComponent(FragmentComponentManager.java:75)
at dagger.hilt.android.internal.managers.FragmentComponentManager.generatedComponent(FragmentComponentManager.java:63)
at com.zhixin.wedeep.homepage.ui.Hilt_HomePage.generatedComponent(Hilt_HomePage.java:70)
at com.zhixin.wedeep.homepage.ui.Hilt_HomePage.inject(Hilt_HomePage.java:89)
at com.zhixin.wedeep.homepage.ui.Hilt_HomePage.initializeComponentContext(Hilt_HomePage.java:53)
at com.zhixin.wedeep.homepage.ui.Hilt_HomePage.onAttach(Hilt_HomePage.java:45)
at androidx.fragment.app.Fragment.onAttach(Fragment.java:1602)
at com.zhixin.wedeep.homepage.ui.Hilt_HomePage.onAttach(Hilt_HomePage.java:35)
at com.zhixin.wedeep.homepage.ui.HomePage.onAttach(HomePage.kt:281)

This is my test code.

@HiltAndroidTest
@UninstallModules(HomePageDataModule::class)
@RunWith(AndroidJUnit4::class)
@LargeTest
class TestHomePageFragment {

    private val c = Composition("cyrus", "background", "description", "downloadUrl", "1000", "url", "1", true, "100", 100, "100", "test", "title", "1", "100", "cover", ArrayList(), "ONCE", null)

    @Inject
    lateinit var cpd: CompositionDao

    @get:Rule
    var hiltRule = HiltAndroidRule(this)




    @Before
    fun init() {
        hiltRule.inject()
        Util.RETROFIT

        Util.enqueueResponse("mainpage.json")

        cpd.createComposition(c)
        cpd.createBrowseRecord(BrowseRecord(c.id, System.currentTimeMillis()))
        val s = launchFragment<HomePage>()
        s.onFragment {
            IdlingRegistry.getInstance().register(it.mIdleResource)
        }
    /*    dataBindingIdlingResourceRul = DataBindingIdlingResourceRule(s)
        dataBindingIdlingResourceRul.starting(null)*/

    }


    @Test
    fun testDataInitial() {

        onView(ViewMatchers.withId(R.id.recycler_view_preview_data))
                .perform(RecyclerViewActions.scrollToPosition<RecyclerView.ViewHolder>(1))
    }

    @After
    fun finish(){

    }

}

Any idea for this question?

Answer 1

As stated on Hilt guide, "Testing" section:

Warning: Hilt does not currently support FragmentScenario because there is no way to specify an activity class, and Hilt requires a Hilt fragment to be contained in a Hilt activity. One workaround for this is to launch a Hilt activity and then attach your fragment.

The error is happening since hilt-managed fragment should be attached to a hilt-managed Activity as well, in short, both should be annotated with @AndroidEntryPoint. Because FragmentScenario uses an EmptyFragmentActivity to hold the underlying fragment being tested, currently there's no way to integrate Hilt with FragmentScenario. An workaround is to launch an activity and then attach the fragment to it.

Answer 2

For your testing purpose if you want to test fragment instrumented test you can do the following step:

1. Create New Activity for Activity Container in your debug source set (or if you don't have debug folder/source set just make it in your main package) you can see the code here and register the activity in Android manifest.

2. And finally create this inline function in your androidTest package.

You can just literally copy-paste code that I have mentioned. It worked well for me. Those code are provided by Manuel Vivo.

Answer 3

The solution lies in this Github project -> https://github.com/android/architecture-samples/blob/dev-hilt/app/src/androidTest/java/com/example/android/architecture/blueprints/todoapp/HiltExt.kt