NPE调用MockitoAnnotations.initMocks（）的Andr​​oidTestCase时

问题描述

尝试使用的Mockito我AndroidTestCase。我添加了依赖于build.gradle：

Trying to use mockito in my AndroidTestCase. I added the dependencies to the build.gradle:

final DEXMAKER_VERSION = '1.2'

dependencies {
    // ...
    androidTestCompile "com.google.dexmaker:dexmaker:${DEXMAKER_VERSION}"
    androidTestCompile "com.google.dexmaker:dexmaker-mockito:${DEXMAKER_VERSION}"
    androidTestCompile 'org.mockito:mockito-core:1.10.19'

}

用的Mockito初始化测试用例：

The TestCase with the mockito initialization:

public class UsersListPresenterTest extends AndroidTestCase {

    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);
    }

    public void testInitialize() throws Exception {

    }
}

但只要我添加任何属性类，甚至在添加任何注解测试开始崩溃：

But as soon as I add any attribute to the class, even before adding any annotation the test start to crash:

public class UsersListPresenterTest extends AndroidTestCase {

    String mockString;

    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);
    }

    public void testInitialize() throws Exception {

    }
}

通过下面的堆栈跟踪

java.lang.NullPointerException: Attempt to invoke virtual method
    'java.lang.Class java.lang.Object.getClass()' on a null object reference
at com.google.dexmaker.mockito.DexmakerMockMaker.getInvocationHandlerAdapter(DexmakerMockMaker.java:80)
at com.google.dexmaker.mockito.DexmakerMockMaker.getHandler(DexmakerMockMaker.java:75)
at org.mockito.internal.util.MockUtil.isMockitoMock(MockUtil.java:74)
at org.mockito.internal.util.MockUtil.isMock(MockUtil.java:66)
at org.mockito.internal.configuration.injection.scanner.MockScanner.isMockOrSpy(MockScanner.java:86)
at org.mockito.internal.configuration.injection.scanner.MockScanner.preparedMock(MockScanner.java:72)
at org.mockito.internal.configuration.injection.scanner.MockScanner.scan(MockScanner.java:61)
at org.mockito.internal.configuration.injection.scanner.MockScanner.addPreparedMocks(MockScanner.java:47)
at org.mockito.internal.configuration.InjectingAnnotationEngine.injectMocks(InjectingAnnotationEngine.java:96)
at org.mockito.internal.configuration.InjectingAnnotationEngine.processInjectMocks(InjectingAnnotationEngine.java:62)
at org.mockito.internal.configuration.InjectingAnnotationEngine.process(InjectingAnnotationEngine.java:56)
at org.mockito.MockitoAnnotations.initMocks(MockitoAnnotations.java:108)
at com.myproject.presentation.UsersListPresenterTest.setUp(UsersListPresenterTest.java:28)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1853)

我是什么做错了吗？

What am I doing wrong?

推荐答案

您可以尝试更换

MockitoAnnotations.initMocks(this);

本

System.setProperty("dexmaker.dexcache", getContext().getCacheDir().getPath());

这对我的作品。 见参考文献这里

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