junit3&junit4

Junit3和junit4不仅是语法的差别，引入的包不同，使用的TestRunner也不同。

Approach A (JUnit 3-style): create a class that extends TestCase, and start test methods with the wordtest. When running the class as a JUnit Test (in Eclipse), all methods starting with the word test are automatically run.

import junit.framework.TestCase;
public class DummyTestA extends TestCase {

    public void testSum() {
        int a = 5;
        int b = 10;
        int result = a + b;
        assertEquals(15, result);
    }
}

Junit3:

java -classpath .;junit.jar junit.textui.TestRunner TestSample

Approach B (JUnit 4-style): create a 'normal' class and prepend a @Test annotation to the method. Note that you do NOT have to start the method with the word test.

import org.junit.*;
import static org.junit.Assert.*;

public class DummyTestB {

    @Test
    public void Sum() {
        int a = 5;
        int b = 10;
        int result = a + b;
        assertEquals(15, result);
    }
}

Junit4:

java -classpath .;./junit.jar;./hamcrest-core-1.3.jar org.junit.runner.JUnitCore TestSample

Mixing the two seems not to be a good idea, see e.g. this stackoverflow question:

http://blog.youkuaiyun.com/xufei96/article/details/7331482

http://blog.youkuaiyun.com/ai92/article/details/302844