android上实现Junit单元测试

本来以为在android上实现单元测试，应该是很简单的一件事，结果还是花费了一些功夫，主要是在配置文件，和测试环境上花费了不少时间，比想像中要复杂一些，不过也没什么高深的东西，下面简单讲一下。
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。

public class TestMath extends AndroidTestCase {private int i1;private int i2;    static final String LOG_TAG = "MathTest";    @Overrideprotected 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));    }@Overrideprotected void tearDown() throws Exception {super.tearDown();}@Overridepublic 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。

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

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;@Overrideprotected 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() {@Overridepublic 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;}@Overridepublic 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();}@Overridepublic void addError(Test test, Throwable t) {errorCount++;showMessage(t.getMessage() + "\n");}@Overridepublic void addFailure(Test test, AssertionFailedError t) {failureCount++;showMessage(t.getMessage() + "\n");}@Overridepublic void endTest(Test test) {showResult(getResult());}@Overridepublic void startTest(Test test) {testCount++;}private String getResult() {int successCount = testCount - failureCount - errorCount;return "Test:" + testCount + " Success:" + successCount + " Failed:" + failureCount + " Error:" + errorCount;}}}

第四步：修改AndroidManifest.xml,加入<uses-library android:name="android.test.runner" />，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 version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.test.sample"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">        <activity android:name=".TestActivity"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity><uses-library android:name="android.test.runner" />    </application>    <uses-sdk android:minSdkVersion="4" /></manifest>

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