我找到了解决办法

问题是

Caused by: java.lang.NoClassDefFoundError: com.android.myproject.MyActivityClass

它找不到类路径，即使我是指同一个jar在两个项目（我也尝试过使用单独的JAR两个项目）

It cannot find the class path even though I refer the same jar in both projects ( I also tried by using separate jar for both the project )

现在，我创造了我的测试环境在同一个项目，然后它的工作

Now, I created my testing environment in the same project, then it worked

在我的的Andr​​oidManifest.xml

<manifest...>
    <!-- For doing JUnit test, Instrumentation Start (remove later) -->
    <instrumentation
        android:targetPackage="com.pe.android.isccasinos"
        android:name="android.test.InstrumentationTestRunner" />
    <!-- For doing JUnit test, Instrumentation End (remove later) -->   
    <application ...>
    ................
    <!-- For doing JUnit test, add library starting (remove later) -->
        <uses-library
            android:name="android.test.runner" />
        <!-- For doing JUnit test, add library ending (remove later) -->
    </application>
<manifest>

然后我说我的测试类在我的特殊包测试

Then I added my Testing class in my special package for testing

extends ActivityInstrumentationTestCase2<fragmentActivity>

现在一切正常:)