如何在 android activity 测试中模拟 koin 注入的 bean 并捕获作为此模拟参数给出的 lambda？

Question

我花了很多时间在 android activity 中找到了一种模拟 Koin bean 的聪明方法。不幸的是 none 令人满意......直到 koin-1.0.0-alpha22 发布

谢谢@arnaudgiuliani。

可在此处找到完整示例AndroidTestKoin sample project

希望对您有所帮助帕特里斯

Answer 1

此示例演示了如何在 androidTest 中使用 koin declareMock() 来捕获然后调用作为一个模拟 bean 的参数给定的 lambda。

class CastManager() : ICastManager {
    private val devices = HashMap<String, Device>()

    init {
        devices["MyDevice"] = Device("MyDevice", "0000")
    }

    override fun getDevices(onSuccess: (List<Device>) -> Unit, onError: (Int) -> Unit){
        onSuccess(devices.values as List<Device>)
    }
}

主要 activity 在其 onCreate 中需要一个 castManager 实例。

class MainActivity: AppCompatActivity() {

    private val castManager by inject<ICastManager>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)

        castManager.getDevices(
                        {devices: List<Device> -> onSuccess(devices)},
                        {error: Int -> onError(error)} )

        fab.setOnClickListener { view ->
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show()
        }
    }
...

真正的bean像往常一样声明...

val applicationModules = listOf(
        module {
            single() { CastManager() as ICastManager }
        }
)

Koin是由应用程序启动的

open class MyApplication: Application() {

    override fun onCreate() {
        startKoin(this, applicationModules, logger = if (BuildConfig.DEBUG) AndroidLogger() else EmptyLogger())
        super.onCreate()
    }
}

从 koin-1.0.0-alpha23 开始我们可以使用 declareMock() 注入模拟实例

@RunWith(AndroidJUnit4::class)
class MainActivityTest: KoinTest {

    val myBeanToMock: ICastManager by inject()

    @Rule
    @JvmField
    //As interaction with mock starts in activity's onCreate we can't launch it before mock configuration
    val rule = object : ActivityTestRule<MainActivity>(MainActivity::class.java, false, false) {}

    @Before
    fun setUp() {
        loadKoinModules(applicationModules)
        declareMock<ICastManager>()
    }

    @After
    fun tearDown() {
        rule.finishActivity()
        closeKoin()
    }

    @Test
    fun verifyMockInjection() {
        // We want to capture lambda callbacks given as argument to the mock to interact with it's caller

        doAnswer {
            //arguments[0] is the onSuccess method
            @Suppress("UNCHECKED_CAST")
            (it.arguments[0] as (List<Device>) -> Unit).invoke(listOf(Device("myMockedDevice", "2000")))
        }.whenever(myBeanToMock).getDevices(any(), any())

        rule.launchActivity(null)
        BaristaVisibilityAssertions.assertDisplayed(R.string.my_mocked_device)
    }
}

Koin 版本 1.0.0-alpha22 中的 createMock() 已被 declareMock 取代，以避免与 Mockito 的 createMock 冲突

如何在 android activity 测试中模拟 koin 注入的 bean 并捕获作为此模拟参数给出的 lambda？

How to mock a koin injected bean in android activity test and capture lambda given as parameter of this mock?

android

testing

kotlin

mocking

koin