Case

Test.kt

abstract class TestBaseViewModel : ViewModel() {

    abstract suspend fun loadData()

    init {
        viewModelScope.launch {
            loadData()
        }
    }
}

class TestViewModel : TestBaseViewModel() {

    override suspend fun loadData() {
        println("Boop")
    }
}

class BaseTest {

    @ExperimentalCoroutinesApi
    private val dispatcher = TestCoroutineDispatcher()

    @BeforeEach
    @ExperimentalCoroutinesApi
    fun setUp() {
        Dispatchers.setMain(dispatcher)
    }

    @AfterEach
    @ExperimentalCoroutinesApi
    fun tearDown() {
        Dispatchers.resetMain()
        dispatcher.cleanupTestCoroutines()
    }

    @Test
    fun `init should invoke loadData`() {
        val vm = spyk(TestViewModel())

        coVerify(exactly = 1) {
            vm.loadData()
        }
    }
}