一、unit中集中基本注解，是必须掌握的。
@BeforeClass – 表示在类中的任意public static void方法执行之前执行
@AfterClass – 表示在类中的任意public static void方法执行之后执行
@Before – 表示在任意使用@Test注解标注的public void方法执行之前执行
@After – 表示在任意使用@Test注解标注的public void方法执行之后执行
@Test – 使用该注解标注的public void方***表示为一个测试方法

二、使用示例

package org.byron4j.spring_mvc_log4j;
 
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
 
public class BasicAnnotationTest {
    // Run once, e.g. Database connection, connection pool
    @BeforeClass
    public static void runOnceBeforeClass() {
        System.out.println("@BeforeClass - runOnceBeforeClass");
    }
 
    // Run once, e.g close connection, cleanup
    @AfterClass
    public static void runOnceAfterClass() {
        System.out.println("@AfterClass - runOnceAfterClass");
    }
 
    // Should rename to @BeforeTestMethod
    // e.g. Creating an similar object and share for all @Test
    @Before
    public void runBeforeTestMethod() {
        System.out.println("@Before - runBeforeTestMethod");
    }
 
    // Should rename to @AfterTestMethod
    @After
    public void runAfterTestMethod() {
        System.out.println("@After - runAfterTestMethod");
    }
 
    @Test
    public void test_method_1() {
        System.out.println("@Test - test_method_1");
    }
 
    @Test
    public void test_method_2() {
        System.out.println("@Test - test_method_2");
    }
}

【输出】

@BeforeClass - runOnceBeforeClass
@Before - runBeforeTestMethod
@Test - test_method_1
@After - runAfterTestMethod
@Before - runBeforeTestMethod
@Test - test_method_2
@After - runAfterTestMethod
@AfterClass - runOnceAfterClass

来源：https://blog.csdn.net/zixiao217/article/details/52951679