1 具體過程:新建一個工程->新建一個被測試類Car.java->新建一個JunitTestCase: TestCar.java->運行測試case:選擇run as JUnit Test.
2 如下為這兩個類的源碼:
Car.java

1 public ??? class ???Car??? {???
2 ????????
3 public ??? int ???getWheels() {??? // 簡單的返回3
4 ?????????????? return ??? 3 ;???
5 ??????????} ???
6 ????
7 }
8

?1import???junit.framework.*;???
?2public???class???TestCar???extends???TestCase???{???
?3??????protected???int???expectedWheels;???
?4??????protected???Car???myCar;???
?5????
?6??????public???TestCar(String???s)???{???
?7??????????super(s);???
?8??????}???
?9????
10??????protected???void???setUp()???{???
11??????????expectedWheels???=???6;???
12??????????myCar???=???new???Car();???
13??????}???
14??????public???static???Test???suite()???{???
15??????????return?????new???TestSuite(TestCar.class);???
16??????}???
17??????public???void???testGetWheels()???{???
18??????????assertEquals(expectedWheels,???myCar.getWheels());???//一個簡單的測試方法：判斷expectedWheels的值與myCar對象取得大值是否相等
19??????}???
20??????protected???void???tearDown()???{//todo???
21??????}???
22????
23??}

3 運行結果:
junit.framework.AssertionFailedError: expected:<6> but was:<3>
?at junit.framework.Assert.fail(Assert.java:47)
?at junit.framework.Assert.failNotEquals(Assert.java:282)
?at junit.framework.Assert.assertEquals(Assert.java:64)
?at junit.framework.Assert.assertEquals(Assert.java:201)
?at junit.framework.Assert.assertEquals(Assert.java:207)
?at TestCar.testGetWheels(TestCar.java:18)
?at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
?at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
?at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
?at java.lang.reflect.Method.invoke(Unknown Source)
?at junit.framework.TestCase.runTest(TestCase.java:154)
?at junit.framework.TestCase.runBare(TestCase.java:127)
?at junit.framework.TestResult$1.protect(TestResult.java:106)
?at junit.framework.TestResult.runProtected(TestResult.java:124)
?at junit.framework.TestResult.run(TestResult.java:109)
?at junit.framework.TestCase.run(TestCase.java:118)
?at junit.framework.TestSuite.runTest(TestSuite.java:208)
?at junit.framework.TestSuite.run(TestSuite.java:203)
?at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
?at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
?at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

如果把Car.java中的返回值改為6,運行結果會成功.