在Android上實現Junit單元測試的四部曲
來源: JavaEye 發布時間: 2010-10-17 22:44 閱讀: 2331 次 推薦: 0 原文鏈接 [收藏]
摘要：本文講述在Android上實現Junit單元測試，利用JUnit等單元測試框架進行單元測試對于Java程序員并不陌生，利用這些非常有效的工具，使得代碼的質量得到有效的監控和維護。
我們曾經和大家探討過全面剖析Java ME單元測試理念，其實在Android上實現JUnit單元測試也不是很困難，主要是在配置文件和測試環境上將花費很長時間，下面從四步簡單講一下在Android上實現Junit單元測試。
第一步：新建一個TestCase，記得要繼承androidTestCase，才能有getContext()來獲取當前的上下文變量，這在Android測試中很重要的，因為很多的Android api都需要context。
Java代碼
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：新建一個TestSuit，這個就繼承Junit的TestSuite就可以了，注意這里是用的addTestSuite方法，一開始使用addTest方法就是不能成功。
Java代碼
publicclass ExampleSuite extends TestSuite {
public ExampleSuite() {
addTestSuite(TestMath.class);
}
}
第三步：新建一個Activity，用來啟動單元測試，并顯示測試結果。系統的AndroidTestRunner竟然什么連個UI界面也沒有實現，這里只是最簡單的實現了一個
Java代碼
代碼
1. public class TestActivity extends Activity {
2.
3. private TextView resultView;
4.
5. private TextView barView;
6.
7. private TextView messageView;
8.
9. private Thread testRunnerThread;
10.
11. private static final int SHOW_RESULT = 0;
12.
13. private static final int ERROR_FIND = 1;
14.
15. @Override
16. protected void onCreate(Bundle savedInstanceState) {
17. super.onCreate(savedInstanceState);
18. setContentView(R.layout.main);
19. resultView = (TextView)findViewById(R.id.ResultView);
20. barView = (TextView)findViewById(R.id.BarView);
21. messageView = (TextView)findViewById(R.id.MessageView);
22. Button lunch = (Button)findViewById(R.id.LunchButton);
23. lunch.setOnClickListener(new View.OnClickListener() {
24. @Override
25. public void onClick(View v) {
26. startTest();
27. }
28. });
29. }
30.
31. private void showMessage(String message) {
32. hander.sendMessage(hander.obtainMessage(ERROR_FIND, message));
33. }
34.
35. private void showResult(String text) {
36. hander.sendMessage(hander.obtainMessage(SHOW_RESULT, text));
37. }
38.
39. private synchronized void startTest() {
40. if (testRunnerThread != null
41. && testRunnerThread.isAlive()) {
42. testRunnerThread = null;
43. }
44. if (testRunnerThread == null) {
45. testRunnerThread = new Thread(new TestRunner(this));
46. testRunnerThread.start();
47. } else {
48. Toast.makeText(this,
49. "Test is still running",
50. Toast.LENGTH_SHORT).show();
51. }
52. }
53.
54. public Handler hander = new Handler() {
55. public void handleMessage(Message msg) {
56. switch (msg.what) {
57. case SHOW_RESULT:
58. resultView.setText(msg.obj.toString());
59. break;
60. case ERROR_FIND:
61. messageView.append(msg.obj.toString());
62. barView.setBackgroundColor(Color.RED);
63. break;
64. default:
65. break;
66. }
67. }
68. };
69.
70. class TestRunner implements Runnable, TestListener {
71.
72. private Activity parentActivity;
73.
74. private int testCount;
75.
76. private int errorCount;
77.
78. private int failureCount;
79.
80. public TestRunner(Activity parentActivity) {
81. this.parentActivity = parentActivity;
82. }
83.
84. @Override
85. public void run() {
86. testCount = 0;
87. errorCount = 0;
88. failureCount = 0;
89.
90. ExampleSuite suite = new ExampleSuite();
91. AndroidTestRunner testRunner = new AndroidTestRunner();
92. testRunner.setTest(suite);
93. testRunner.addTestListener(this);
94. testRunner.setContext(parentActivity);
95. testRunner.runTest();
96. }
97.
98. @Override
99. public void addError(Test test, Throwable t) {
100. errorCount++;
101. showMessage(t.getMessage() + "\n");
102. }
103.
104. @Override
105. public void addFailure(Test test, AssertionFailedError t) {
106. failureCount++;
107. showMessage(t.getMessage() + "\n");
108. }
109.
110. @Override
111. public void endTest(Test test) {
112. showResult(getResult());
113. }
114.
115. @Override
116. public void startTest(Test test) {
117. testCount++;
118. }
119.
120. private String getResult() {
121. int successCount = testCount - failureCount - errorCount;
122. return "Test:" + testCount + " Success:" + successCount + " Failed:" + failureCount + " Error:" + errorCount;
123. }
124.
125. }
126.
127. }
第四步：修改AndroidManifest.xml,加入，不然會提示找不到AndroidTestRunner，這里需要注意是這句話是放在applications下面的，我一開始也不知道，放錯了地方，浪費了不少時間
Xml代碼
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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