在Android上实现Junit单元测试的四部曲

第一步：新建一个TestCase，记得要继承androidTestCase，才能有getContext()来获取当前的上下文变量，这在Android测试中很重要的，因为很多的Android api都需要context。

Java代码

publicclassTestMathextendsAndroidTestCase{

privateinti1;
privateinti2;
staticfinalStringLOG_TAG="MathTest";

@Override
protectedvoidsetUp()throwsException{
i1=2;
i2=3;
}

publicvoidtestAdd(){
assertTrue("testAddfailed",((i1+i2)==5));
}

publicvoidtestDec(){
assertTrue("testDecfailed",((i2-i1)==1));
}

@Override
protectedvoidtearDown()throwsException{
super.tearDown();
}

@Override
publicvoidtestAndroidTestCaseSetupProperly(){
super.testAndroidTestCaseSetupProperly();
//Log.d(LOG_TAG,"testAndroidTestCaseSetupProperly");
}

}

第二步：新建一个TestSuit，这个就继承Junit的TestSuite就可以了，注意这里是用的addTestSuite方法，一开始使用addTest方法就是不能成功。

Java代码

publicclassExampleSuiteextendsTestSuite{

publicExampleSuite(){
addTestSuite(TestMath.class);
}

}

第三步：新建一个Activity，用来启动单元测试，并显示测试结果。系统的AndroidTestRunner竟然什么连个UI界面也没有实现，这里只是最简单的实现了一个

Java代码

publicclassTestActivityextendsActivity{

privateTextViewresultView;

privateTextViewbarView;

privateTextViewmessageView;

privateThreadtestRunnerThread;

privatestaticfinalintSHOW_RESULT=0;

privatestaticfinalintERROR_FIND=1;

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
resultView=(TextView)findViewById(R.id.ResultView);
barView=(TextView)findViewById(R.id.BarView);
messageView=(TextView)findViewById(R.id.MessageView);
Buttonlunch=(Button)findViewById(R.id.LunchButton);
lunch.setOnClickListener(newView.OnClickListener(){
@Override
publicvoidonClick(Viewv){
startTest();
}
});
}

privatevoidshowMessage(Stringmessage){
hander.sendMessage(hander.obtainMessage(ERROR_FIND,message));
}

privatevoidshowResult(Stringtext){
hander.sendMessage(hander.obtainMessage(SHOW_RESULT,text));
}

privatesynchronizedvoidstartTest(){
if(testRunnerThread!=null
&&testRunnerThread.isAlive()){
testRunnerThread=null;
}
if(testRunnerThread==null){
testRunnerThread=newThread(newTestRunner(this));
testRunnerThread.start();
}else{
Toast.makeText(this,
"Testisstillrunning",
Toast.LENGTH_SHORT).show();
}
}

publicHandlerhander=newHandler(){
publicvoidhandleMessage(Messagemsg){
switch(msg.what){
caseSHOW_RESULT:
resultView.setText(msg.obj.toString());
break;
caseERROR_FIND:
messageView.append(msg.obj.toString());
barView.setBackgroundColor(Color.RED);
break;
default:
break;
}
}
};

classTestRunnerimplementsRunnable,TestListener{

privateActivityparentActivity;

privateinttestCount;

privateinterrorCount;

privateintfailureCount;

publicTestRunner(ActivityparentActivity){
this.parentActivity=parentActivity;
}

@Override
publicvoidrun(){
testCount=0;
errorCount=0;
failureCount=0;

ExampleSuitesuite=newExampleSuite();
AndroidTestRunnertestRunner=newAndroidTestRunner();
testRunner.setTest(suite);
testRunner.addTestListener(this);
testRunner.setContext(parentActivity);
testRunner.runTest();
}

@Override
publicvoidaddError(Testtest,Throwablet){
errorCount++;
showMessage(t.getMessage()+"\n");
}

@Override
publicvoidaddFailure(Testtest,AssertionFailedErrort){
failureCount++;
showMessage(t.getMessage()+"\n");
}

@Override
publicvoidendTest(Testtest){
showResult(getResult());
}

@Override
publicvoidstartTest(Testtest){
testCount++;
}

privateStringgetResult(){
intsuccessCount=testCount-failureCount-errorCount;
return"Test:"+testCount+"Success:"+successCount+"Failed:"+failureCount+"Error:"+errorCount;
}

}

}

第四步：修改AndroidManifest.xml,加入，不然会提示找不到AndroidTestRunner，这里需要注意是这句话是放在applications下面的，我一开始也不知道，放错了地方，浪费了不少时间

Xml代码

xmlversion="1.0"encoding="utf-8"?>
<manifestxmlns:Android="http://schemas.Android.com/apk/res/Android"
package="com.test.sample"
Android:versionCode="1"
Android:versionName="1.0">
<applicationAndroid:icon="@drawable/icon"Android:label="@string/app_name"Android:debuggable="true">
<activityAndroid:name=".TestActivity"
Android:label="@string/app_name">
<intent-filter>
<actionAndroid:name="Android.intent.action.MAIN"/>
<categoryAndroid:name="Android.intent.category.LAUNCHER"/>
intent-filter>
activity>
<uses-libraryAndroid:name="Android.test.runner"/>
application>
<uses-sdkAndroid:minSdkVersion="4"/>
manifest>