Error when trying to mock the NavController

Question

Trying to follow the example https://developer.android.com/guide/navigation/navigation-testing, I have an expected error

org.mockito.exceptions.base.MockitoException: Mockito cannot mock this class: class androidx.navigation.NavController.

even after include all the dependencies as here: https://developer.android.com/training/testing/set-up-project

@RunWith(AndroidJUnit4::class)
class MyShopFragmentTest {

    @Test
    fun testMyShopScenario_F001() {
        // Create a mock NavController
        val mockNavController = mock(NavController::class.java)

        // Create a graphical FragmentScenario for the MyShopFragment
        val myShopFragmentScenario = launchFragmentInContainer<MyShopFragment>()

        // Set the NavController property on the fragment
        myShopFragmentScenario.onFragment { fragment ->
            Navigation.setViewNavController(fragment.requireView(), mockNavController)
        }

        // Verify that performing a click prompts the correct Navigation action
        onView(ViewMatchers.withId(R.id.search)).perform(ViewActions.click())
        verify(mockNavController).navigate(R.id.searchFragment)
    }
}

Any idea?

Answer 1

The solution was use the all-open annotation (https://kotlinlang.org/docs/reference/compiler-plugins.html) and configure the project as described here --> https://developer.android.com/training/testing/set-up-project