Android Mockito kotlin.UninitializedPropertyAccessException：lateinit属性dataManager尚未初始化

Question

我在Mockito测试中经常得到kotlin.UninitializedPropertyAccessException: lateinit property xxx has not been initialized。但该应用程序工作正常。注意：我不想将演示者注入活动。提前致谢！

这是我的活动：

class CreateAccountActivity : AppCompatActivity(), CreateAccountView {

private var presenter: CreateAccountPresenter? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_create_account)
    presenter = CreateAccountPresenter()
    ((application) as CariumApp).getDaggerComponent().inject(presenter!!)

    presenter?.attachView(this)
}

这是我的演示者：

class CreateAccountPresenter {
private var view: CreateAccountView? = null

@Inject
lateinit var dataManager: DataManager

fun attachView(view: CreateAccountView) {
    this.view = view

    dataManager.getServiceDocuments(true, object : GetServiceDocumentsListener { 
       // ...
    })
}

这是我的DataManager：

interface DataManager {
    fun getServiceDocuments(latest: Boolean, listener: GetServiceDocumentsListener)
}

和AppDataManager：

Singleton
class AppDataManager @Inject constructor(context: Context) : DataManager {
// ...
}

最后我的测试失败了：

class CreateAccountPresenterTest {

val mockDataManager: DataManager = mock()

val mockCreateAccountView: CreateAccountView = mock()

private val createAccountPresenter = CreateAccountPresenter()

@Test
fun getServiceDocuments() {
    doAnswer {
        val args = it.arguments
        (args[1] as GetServiceDocumentsListener).onError()
        null
    }.`when`(mockDataManager).getServiceDocuments(Mockito.anyBoolean(), anyOrNull())

    createAccountPresenter.attachView(mockCreateAccountView)

    verify(mockCreateAccountView).hideLoadingDialog()
}
}

gradle文件：

testImplementation 'junit:junit:4.12'
testImplementation 'org.mockito:mockito-core:2.22.0'
testImplementation "org.mockito:mockito-inline:2.22.0"
testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.0.0-RC1"
implementation 'com.google.dagger:dagger:2.16'
kapt 'com.google.dagger:dagger-compiler:2.16'

我的模块类：

@Module
open class MyModule(private var context: Context) {

@Provides
open fun provideContext(): Context {
    return context
}

@Provides
@Singleton
internal fun provideDataManager(appDataManager: AppDataManager): DataManager {
    return appDataManager
}
}

实际错误是kotlin.UninitializedPropertyAccessException：lateinit属性dataManager尚未初始化

Answer 1

你在哪里有DataManager @Provides方法？ Dagger识别@Inject中的AppDataManager构造函数，但不能将其识别为界面。为Dagger创建抽象模块并使用@Binds

https://proandroiddev.com/dagger-2-annotations-binds-contributesandroidinjector-a09e6a57758f

Answer 2

您没有将模拟分配给该字段。在您的测试方法中分配它。在致电attachView()之前

createAccountPresenter.dataManager = mockDataManager