FragmentActivity Junit 测试

Me used FragmentAndroid 兼容包，使用android-support-v4.jar。但我无法对此进行 JUnit 测试。

My main FragmentActivity类声明如下

public class MyActivityClass extends FragmentActivity{
...............
}

然后在我的测试项目中

public class MyActivityClassTest extends ActivityInstrumentationTestCase2<MyActivityClass> {
    public MyActivityClassTest() {  
        super("com.android.myproject", MyActivityClass.class);
    }
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        ...................
    }

    public void testPreconditions() {
        .................
    }
    public void testNotNull(){
        ................
    }
}

但是当我运行时Android JUnit Test生产FailedToCreateTests[Runner:Junit3]
故障追踪

java.lang.RuntimeException: Exception during suite construction
at android.test.suitebuilder.TestSuiteBuilder$FailedToCreateTests.testSuiteConstructionFailed(TestSuiteBuilder.java:239)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:430)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)
Caused by: java.lang.reflect.InvocationTargetException
at com.android.myproject.test.MyActivityClassTest.<init>(MyActivityClassTest.java:28)
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:446)
at android.test.suitebuilder.TestMethod.instantiateTest(TestMethod.java:87)
at android.test.suitebuilder.TestMethod.createTest(TestMethod.java:73)
at android.test.suitebuilder.TestSuiteBuilder.addTest(TestSuiteBuilder.java:263)
at android.test.suitebuilder.TestSuiteBuilder.build(TestSuiteBuilder.java:185)
at android.test.InstrumentationTestRunner.onCreate(InstrumentationTestRunner.java:336)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3982)
at android.app.ActivityThread.access$2900(ActivityThread.java:119)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1901)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4363)
at java.lang.reflect.Method.invokeNative(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoClassDefFoundError: com.android.myproject.MyActivityClass
... 19 more

当我改变的时候MyActivityClass延伸Activity效果很好(MyActivityClass extends Activity)
我也用过同样的android-support-v4.jar在我的测试和主项目中

ActivityInstrumentationTestCase2兼容于Fragments。您应该只按照中提到的步骤进行操作Android 测试：外部库 http://dtmilano.blogspot.com/2009/12/android-testing-external-libraries.html，已更新以涵盖以下情况android-support-v4.jar too.

然后，您将能够编写如下测试：

public void testFragmentManager() {
    FragmentActivity activity = getActivity();
    assertNotNull(activity.getSupportFragmentManager());
}

或者任何你需要测试的东西。