????1.??д?????? extends AndroidTestCase
????2.??д???????? ???η???public ????????????????? throws Exception
????3.???ж???
????4.?嵥???????????
??????application???????
????<user-library android:name="android.test.runner" />
??????manifest???????????
????<instrumentation  android:name="android.test.InstrumentationTestRunner" android:targetPackage="com.zyn.junit">
????</instrumentation>
????5.??????????????????????????????????????