如何结合PowerMock和Robolectric

我有一个使用Context的静态方法来检查Internet状态。因此，要模拟它，我需要使用PowerMock。我正在使用robolectric来加快测试速度，因为我唯一需要嘲笑的就是被嘲笑。但是我似乎无法配置PowerMock（1.6.6）和Robolectric（3.2.2）一起工作。这是我注释班级的方式：

@RunWith(RobolectricTestRunner.class)
@org.robolectric.annotation.Config(constants = BuildConfig.class, sdk = 21)
@PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*"})
@PrepareForTest({Utils.class})

并在设置方法中的这一行：

PowerMockito.mockStatic(Utils.class);

但我收到此异常：

org.powermock.api.mockito.ClassNotPreparedException: 
The class com.zeyad.usecases.data.utils.Utils not prepared for test.
To prepare this class, add class to the '@PrepareForTest' annotation.
In case if you don't use this annotation, add the annotation on class or  method level. 

at org.powermock.api.mockito.expectation.reporter.MockitoPowerMockReporter.classNotPrepared(MockitoPowerMockReporter.java:32)
at org.powermock.api.mockito.internal.mockcreation.MockTypeValidatorFactory$DefaultMockTypeValidator.validate(MockTypeValidatorFactory.java:38)
at org.powermock.api.mockito.internal.mockcreation.AbstractMockCreator.validateType(AbstractMockCreator.java:10)
at org.powermock.api.mockito.internal.mockcreation.DefaultMockCreator.createMock(DefaultMockCreator.java:56)
at org.powermock.api.mockito.internal.mockcreation.DefaultMockCreator.mock(DefaultMockCreator.java:46)
at org.powermock.api.mockito.PowerMockito.mockStatic(PowerMockito.java:71)
at com.zeyad.usecases.data.repository.stores.DataStoreFactoryJUnitTest.setUp(DataStoreFactoryJUnitTest.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:339)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:259)
at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:41)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:199)

我的build.gradle文件依赖项：

testCompile "junit:junit:$junit"
testCompile "org.hamcrest:hamcrest-library:$hamcrest"
testCompile "com.android.support:support-annotations:$supportLibraryVersion"
testCompile "org.mockito:mockito-core:1.10.19"
testCompile "org.robolectric:robolectric:$robolectric"
testCompile "org.robolectric:shadows-support-v4:$robolectric"
testCompile "org.powermock:powermock-module-junit4:$powerMock"
testCompile "org.powermock:powermock-module-junit4-rule:$powerMock"
testCompile "org.powermock:powermock-api-mockito:$powerMock"
testCompile "org.powermock:powermock-classloading-xstream:$powerMock"