package?com.example.xx.musicplayer3;

import?android.content.Context;
import?android.support.test.InstrumentationRegistry;
import?android.support.test.runner.AndroidJUnit4;

import?org.junit.Test;
import?org.junit.runner.RunWith;

import?static?org.junit.Assert.*;

/**
?*?Instrumented?test?which?will?execute?on?an?Android?device.
?*
?*?@see?Testing?documentation
?*/
@RunWith（AndroidJUnit4.class）
public?class?ExampleInstrumentedTest?{
????@Test
????public?void?useAppContext（）?throws?Exception?{
????????//?Context?of?the?app?under?test.
????????Context?appContext?=?InstrumentationRegistry.getTargetContext（）;

????????assertEquals（“com.example.xx.musicplayer3“?appContext.getPackageName（））;
????}
}