<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
  package="com.pccw" 
  android:versionCode="1" 
  android:versionName="1.0"> 
 <uses-sdk android:minSdkVersion="8" /> 
 <application android:icon="@drawable/icon" android:label="@string/app_name"> 
  <activity android:name=".MainActivity" 
     android:label="@string/app_name"> 
   <intent-filter> 
    <action android:name="android.intent.action.MAIN" /> 
    <category android:name="android.intent.category.LAUNCHER" /> 
   </intent-filter> 
  </activity> 
  <!—添加代码1--> 
  <uses-library android:name="android.test.runner"/> 
</application> 
 <!—添加代码2--> 
  <instrumentation android:name="android.test.InstrumentationTestRunner" 
   android:targetPackage="com.pccw" android:label="aaa"/> 
</manifest>

public class PersonService { 
 public void save(String name){ 
  String sub = name.substring(6); 
 } 
 public int add(int a, int b){ 
  return a+b; 
 } 
}

public class PersonServiceTest extends AndroidTestCase { 
 public void testSave() throws Exception { 
  PersonService service = new PersonService(); 
  service.save(null); 
 } 
 public void testAdd() throws Exception { 
  PersonService service = new PersonService(); 
  int result = service.add(1, 2); 
  Assert.assertEquals(3, result); 
 } 
}