JUnit basic annotation

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一个标准的Junit 4的运行流程，大致如下：
测试类实例化 -> @BeforeClass -> @Before -> @Test -> @After -> @AfterClass

下面的代码输出明确表明了其运行流程：

package com.junit.tutorial;import org.junit.*;import static org.junit.Assert.*;import java.util.*; /** * @author mkyong * */public class BasicAnnotation {     private Collection collection;     @BeforeClass    public static void oneTimeSetUp() {        // one-time initialization code       System.out.println("@BeforeClass - oneTimeSetUp");    }     @AfterClass    public static void oneTimeTearDown() {        // one-time cleanup code    System.out.println("@AfterClass - oneTimeTearDown");    }     @Before    public void setUp() {        collection = new ArrayList();        System.out.println("@Before - setUp");    }     @After    public void tearDown() {        collection.clear();        System.out.println("@After - tearDown");    }     @Test    public void testEmptyCollection() {        assertTrue(collection.isEmpty());        System.out.println("@Test - testEmptyCollection");    }     @Test    public void testOneItemCollection() {        collection.add("itemA");        assertEquals(1, collection.size());        System.out.println("@Test - testOneItemCollection");    }}

结果：
@BeforeClass - oneTimeSetUp
@Before - setUp
@Test - testOneItemCollection
@After - tearDown
@Before - setUp
@Test - testEmptyCollection
@After - tearDown
@AfterClass - oneTimeTearDown

需要注意的是，我们需要申明 @BeforeClass 和 @AfterClass 为静态方法。

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