android – 如何用robolectric覆盖注入的@Singleton类？

概述我有一个片段,我试图使用Robolectric(和Mockito)测试,它使用@Singleton api类.我试图以一种可以自定义每个测试的响应的方式来模拟单例.这是我的片段引用的API类： @Singletonpublic class MyApi { @Inject public MyApi(Context context) { //Do something 我有一个片段,我试图使用Robolectric(和Mockito)测试,它使用@Singleton API类.我试图以一种可以自定义每个测试的响应的方式来模拟单例.这是我的片段引用的API类：

@Singletonpublic class MyAPI {    @Inject    public MyAPI(Context context) {        //Do something    }    public MyObject getMyFeed(){    }}

这是我正在尝试设置的测试类：

@RunWith(RobolectricTestRunner.class)public class MyFragmentTest extends TestCase {    @Inject MyAPIInterceptor myAPI;    @Inject Activity shadowActivity;    @Inject LayoutInflater shadowLayoutInflator;    @Inject VIEwGroup shadowVIEwGroup;    @Before    public voID setUp() throws Exception {        Robolectric.bindShadowClass(SingleThreadActivity.class);        ShadowAPIModule module = new ShadowAPIModule();        Module roboGuiceModule = RoboGuice.newDefaultRoboModule(Robolectric.application);        RoboGuice.setBaseApplicationInjector(Robolectric.application,RoboGuice.DEFAulT_STAGE,roboGuiceModule);        RoboInjector injector = RoboGuice.getInjector(Robolectric.application);        injector.injectMembers(this);    }    @After    public voID tearDown() {        RoboGuice.util.reset();        Application app = Robolectric.application;        DefaultRoboModule defaultModule = RoboGuice.newDefaultRoboModule(app);        RoboGuice.setBaseApplicationInjector(app,defaultModule);    }    @Test    public voID testOnCreateVIEw() throws Exception{        myAPI.mock = mock(MyAPI.class);        when(myAPI.mock.getMyFeed()).thenReturn(new MyObject());        MyFragment frag = new MyFragment();        frag.onAttach(shadowActivity);        frag.onCreate(null);        frag.onCreateVIEw(shadowLayoutInflator,shadowVIEwGroup,null);        frag.onActivityCreated(null);        frag.onStart();        frag.onResume();    }}@Singletonclass MyAPIInterceptor extends MyAPI{    public MyAPI mock;    @Inject    public MyAPIInterceptor(Context context) {        super(context);    }    @OverrIDe    public MyObject getMyFeed() throws Exception {        return mock.getMyFeed();    }}@Implements(Activity.class)class SingleThreadActivity extends ShadowActivity{    @OverrIDe    public voID runOnUiThread(Runnable action) {        action.run();    }}class ShadowAPIModule extends AbstractModule {    @OverrIDe    protected voID configure() {        bind(Context.class).to(MockContext.class);        bind(VIEwGroup.class).toInstance(mock(VIEwGroup.class));        bind(MyAPI.class).to(MyAPIInterceptor.class);    }}

但是,当我运行测试时,我得到以下内容：

com.Google.inject.ConfigurationException: Guice configuration errors:1) No implementation for androID.vIEw.VIEwGroup was bound.  while locating androID.vIEw.VIEwGroup    for fIEld at com.mysource.MyFragmentTest.shadowVIEwGroup(UnkNown Source)  while locating com.mysource.MyFragmentTest1 error    at com.Google.inject.internal.InjectorImpl.getMembersInjector(InjectorImpl.java:952)    at com.Google.inject.internal.InjectorImpl.getMembersInjector(InjectorImpl.java:957)    at com.Google.inject.internal.InjectorImpl.injectMembers(InjectorImpl.java:943)    at roboguice.inject.ContextScopedRoboInjector.injectMembersWithoutVIEws(ContextScopedRoboInjector.java:243)    at roboguice.inject.ContextScopedRoboInjector.injectMembers(ContextScopedRoboInjector.java:236)    at com.mysource.MyFragmentTest.setUp(RSSFeedActivityTest.java:58)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)    at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:44)    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)    at com.xtremelabs.robolectric.RobolectricTestRunner.evaluate(RobolectricTestRunner.java:292)    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)    at org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:71)    at org.junit.runners.BlockJUnit4ClassRunner.runchild(BlockJUnit4ClassRunner.java:49)    at org.junit.runners.ParentRunner.run(ParentRunner.java:193)    at org.junit.runners.ParentRunner.schedule(ParentRunner.java:52)    at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:191)    at org.junit.runners.ParentRunner.access
Module roboGuiceModule = RoboGuice.newDefaultRoboModule(Robolectric.application);
0(ParentRunner.java:42)    at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:184)    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)    at org.junit.runner.JUnitCore.run(JUnitCore.java:157)    at com.intellij.junit4.JUnit4IDeaTestRunner.startRunnerWithArgs(JUnit4IDeaTestRunner.java:76)    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

根据我对roboguice的理解,似乎由于某种原因它不能用ShadowVIEwGroup注入“shadowVIEwGroup”但我不确定为什么.如果我以错误的方式解决这个问题,那么请让我知道,但这似乎应该有效.

你能告诉我们：
1)为什么我的测试不起作用
 要么
 2)注入类使用的自定义单例的更好方法是什么？

解决方法 VIEwGroup实现不可见.你在ShadowAPIModule中声明它没有传递给RoboGuice.

代替：

Module roboGuiceModule = Modules.overrIDe(RoboGuice.newDefaultRoboModule(Robolectric.application)).with(new ShadowAPIModule())

试试这个：

bind(MyAPI.class).to(MyAPIImpl.class).in(Singleton.class);

评论的答案：

如果你在测试中遇到单例问题,那就把它删除吧.应该隔离测试,因此不需要单独模式.

在生产代码中,而不是@Singleton类注释,在Module中设置与Singleton.class的绑定

bind(MyAPI.class).to(MyAPIImpl.class);

对于测试模块,在您的ShadowModule案例中,设置不带Singleton的绑定.

注入阴影类的另一种情况.您应该注入必须获取注入成员或具有不同实现的对象.除非有自定义实现的绑定,否则无需注入VIEwGroup或Activity.

看看第一个Robolectric示例：http://pivotal.github.com/robolectric/只有构造函数,它的工作原理.

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