在 AndroidTestCase 中调用 MockitoAnnotations.initMocks() 时的 NPE

NPE when calling MockitoAnnotations.initMocks() in AndroidTestCase(在 AndroidTestCase 中调用 MockitoAnnotations.initMocks() 时的 NPE)

问题描述

尝试在我的 AndroidTestCase 中使用 mockito.我将依赖项添加到 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'

}

带有 mockito 初始化的 TestCase:

The TestCase with the mockito initialization:

public class UsersListPresenterTest extends AndroidTestCase {

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

    public void testInitialize() throws Exception {

    }
}

但是，一旦我向类添加任何属性，甚至在添加任何注释之前，测试就会开始崩溃:

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 {

    }
}

使用以下堆栈跟踪

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)

我做错了什么?

推荐答案

你可以试试替换

MockitoAnnotations.initMocks(this);

有了这个

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

它对我有用.在此处查看参考

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