如何模拟最终 class？

Question

在 AndroidStudio 工作。想要使用 PowerMock 模拟 AndroidInstrumentalTest 的最终 class。在 gradle 中添加了库：

 androidTestCompile ('org.powermock:powermock-api-mockito:1.5.6')
 androidTestCompile ('org.powermock:powermock-core:1.5.6')
 androidTestCompile ('org.powermock:powermock-module-junit4:1.5.6')
 androidTestCompile 'org.mockito:mockito-core:1.10.8'
 androidTestCompile 'com.google.dexmaker:dexmaker:1.1'
 androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.1'

进行测试class:

public class BluetoothTest extends ActivityInstrumentationTestCaseWithLogIn<PlanActivity> {


 public BluetoothTest() {
    super(PlanActivity.class);
 }


  @Override
  public void setUp() throws Exception{
        super.setUp();          
        BluetoothGatt gatt = PowerMockito.mock(BluetoothGatt.class);
  }
}

堆栈跟踪：

 java.lang.VerifyError: org/mockito/cglib/core/ReflectUtils
at org.mockito.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:167)
at org.mockito.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at org.mockito.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:217)
at org.mockito.cglib.core.KeyFactory$Generator.create(KeyFactory.java:145)
at org.mockito.cglib.core.KeyFactory.create(KeyFactory.java:117)
........
at android.support.test.internal.runner.junit3.JUnit38ClassRunner.run(JUnit38ClassRunner.java:90)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
........
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:270)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1732)

我检查了来自 this issue, with no luck. Apparently solutions help with mockito-core, not powermock. It proved by another issue

的解决方案

我看到了 docs，然后尝试在测试 class 上添加注释 @RunWith(PowerMockRunner.class) 和 @PrepareForTest(BluetoothGatt.class)。结果：

   java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
    at org.powermock.modules.junit4.common.internal.impl.JUnitVersion.getJUnitVersion(JUnitVersion.java:28)
    at org.powermock.modules.junit4.common.internal.impl.JUnitVersion.isGreaterThanOrEqualTo(JUnitVersion.java:23)
    at org.powermock.modules.junit4.PowerMockRunner.getRunnerDelegateImplClass(PowerMockRunner.java:38)
    at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:33)
   ........
    at org.junit.runner.Computer.getSuite(Computer.java:26)
    at android.support.test.internal.runner.TestRequestBuilder.classes(TestRequestBuilder.java:598)
    at android.support.test.internal.runner.TestRequestBuilder.build(TestRequestBuilder.java:578)
    at android.support.test.runner.AndroidJUnitRunner.buildRequest(AndroidJUnitRunner.java:542)
    at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:269)
    at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1732)

Answer 1

在非 root 设备上，APK 受 "verification" 约束，其中 VM 确保 classes 仅引用它们编译所针对的实现。模拟器和 root 设备不受此规则约束。

不幸的是，破解 classloader（PowerMock 和 Robolectric）的实现几乎总是违反该规则，因为它们创建了意想不到的静态 class 和方法实现（为了模拟它们).

让 classloader 攻击您的 JVM 单元测试，而不是您的仪器测试，而是将任何相关接口提取到您可以控制（和模拟）的包装器中。

Answer 2

您是否尝试过使用 Robolectric + Mockito？

我相信你的想法是正确的。它应该很简单：

BluetoothGatt gatt = mock(BluetoothGatt.class);

请看这个例子：

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

private BluetoothGattCharacteristic characteristic;
private OnBoardingService service;
private BluetoothGattReceiver receiver = new BluetoothGattReceiver();

@Before 
public void initialise() {
    BleDevice bleDevice = mock(BleDevice.class);
    when(bleDevice.getType()).thenReturn(BleDeviceType.WunderbarMIC);
    BluetoothGatt gatt = mock(BluetoothGatt.class);
    BluetoothGattService gattService = mock(BluetoothGattService.class);
    when(gatt.getServices()).thenReturn(Arrays.asList(gattService));
    when(gattService.getUuid()).thenReturn(fromString("00002001-0000-1000-8000-00805f9b34fb"));
    characteristic = mock(BluetoothGattCharacteristic.class);
    when(gattService.getCharacteristics()).thenReturn(Arrays.asList(characteristic));

    service = new OnBoardingService(bleDevice, gatt, receiver);
}

来源：https://github.com/relayr/android-sdk/blob/master/tests/src/androidTest/java/io/relayr/ble/service/OnBoardingServiceTest.java https://github.com/relayr/android-sdk/blob/master/tests/src/androidTest/java/io/relayr/ble/service/BluetoothGattReceiverTest.java

如何模拟最终 class？

How make mock of final class?

android

mockito

powermock

android-studio

android-instrumentation