Android Junit单元测试4部曲

发表于:2014-10-29来源:uml.org.cn作者:不详点击数: 标签:单元测试
我们曾经和大家探讨过全面剖析Java ME单元测试理念,其实在Android上实现JUnit单元测试也不是很困难,主要是在配置文件和测试环境上将花费很长时间,下面从四步简单讲一下在Android上实

  我们曾经和大家探讨过全面剖析Java ME单元测试理念,其实在Android上实现JUnit单元测试也不是很困难,主要是在配置文件和测试环境上将花费很长时间,下面从四步简单讲一下在Android上实现Junit单元测试

  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

public class TestMath extends AndroidTestCase {
private int i1;
private int i2;
static final String LOG_TAG = "MathTest";
@Override
protected void setUp() throws Exception {
i1 = 2;
i2 = 3;
}
public void testAdd() {
assertTrue("testAdd failed", ((i1 + i2) == 5));
}
public void testDec() {
assertTrue("testDec failed", ((i2 - i1) == 1));
}
@Override
protected void tearDown() throws Exception {
super.tearDown();
}
@Override
public void testAndroidTestCaseSetupProperly() {
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

public class ExampleSuite extends TestSuite {               
public ExampleSuite() {           
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

public class TestActivity extends Activity {
private TextView resultView;
private TextView barView;
private TextView messageView;
private Thread testRunnerThread;
private static final int SHOW_RESULT = 0;
private static final int ERROR_FIND = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
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);
Button lunch = (Button)findViewById(R.id.LunchButton);
lunch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startTest();
}
});
}
private void showMessage(String message) {
hander.sendMessage(hander.obtainMessage(ERROR_FIND, message));
}
private void showResult(String text) {
hander.sendMessage(hander.obtainMessage(SHOW_RESULT, text));
}
private synchronized void startTest() {
if (testRunnerThread != null
&& testRunnerThread.isAlive()) {
testRunnerThread = null;
}
if (testRunnerThread == null) {
testRunnerThread = new Thread(new TestRunner(this));
testRunnerThread.start();
} else {
Toast.makeText(this,
"Test is still running",
Toast.LENGTH_SHORT).show();
}
}
public Handler hander = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_RESULT:
resultView.setText(msg.obj.toString());
break;
case ERROR_FIND:
messageView.append(msg.obj.toString());
barView.setBackgroundColor(Color.RED);
break;
default:
break;
}
}
};
class TestRunner implements Runnable, TestListener {
private Activity parentActivity;
private int testCount;
private int errorCount;
private int failureCount;
public TestRunner(Activity parentActivity) {
this.parentActivity = parentActivity;
}
@Override
public void run() {
testCount = 0;
errorCount = 0;
failureCount = 0;
ExampleSuite suite = new ExampleSuite();
AndroidTestRunner testRunner = new AndroidTestRunner();
testRunner.setTest(suite);
testRunner.addTestListener(this);
testRunner.setContext(parentActivity);
testRunner.runTest();
}
@Override
public void addError(Test test, Throwable t) {
errorCount++;
showMessage(t.getMessage() + "\n");
}
@Override
public void addFailure(Test test, AssertionFailedError t) {
failureCount++;
showMessage(t.getMessage() + "\n");
}
@Override
public void endTest(Test test) {
showResult(getResult());            }
@Override
public void startTest(Test test) {
testCount++;
}
private String getResult() {
int successCount = testCount - failureCount - errorCount;
return "Test:" + testCount + " Success:" + successCount + " Failed:" + failureCount + " Error:" + errorCount;
}
}
}

原文转自:http://www.uml.org.cn/Test/201308013.asp