Junit 简单示例

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import junit.framework.TestCase;

public class MyTest extends TestCase{

    int[] array ;

    //在每一个test case 开始之前都会被调用
    public void setUp() throws Exception{

        array = new int[]{5,4,3,2,1,0} ;
    }

    public void test1(){

        //success---运行结果1
        assertEquals(5, array[0]);
        //Failure--运行结果2
        //assertEquals(5, array[1]);
        //Error--运行结果3
        //assertEquals(5, array[9]);
    }

    //在每一个test case结束之后都会被调用
    public void tearDown() throws Exception{

        array = null ;
    }

    public static void main(String[] args) {

        //执行类中所有以“test”为开始的方法
        junit.textui.TestRunner.run(MyTest.class);
        junit.swingui.TestRunner.run(MyTest.class);
    }
}

运行结果1：

.
Time: 0

OK (1 test)

运行结果2：

.F
Time: 0.047
There was 1 failure:
1) test1(MyTest)junit.framework.AssertionFailedError: expected:<5> but was:<4>
    at MyTest.test1(MyTest.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
    at MyTest.main(MyTest.java:32)

FAILURES!!!
Tests run: 1, Failures: 1, Errors: 0

运行结果3：

.E
Time: 0
There was 1 error:
1) test1(MyTest)java.lang.ArrayIndexOutOfBoundsException: 9
    at MyTest.test1(MyTest.java:20)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
    at MyTest.main(MyTest.java:32)

FAILURES!!!
Tests run: 1, Failures: 0, Errors: 1

析：

Failure--是指assertXXX的两个参数即预期结果与测试单元实际返回结果不一致。

Error--是指还未进行断言就出现错误。