java - 在 junit 4 @Beforeclass @Before 和 @After 测试用例 : wrong order of execution

Question

我正在尝试使用 Junit 4 库运行一些简单的测试，并使用 @Before、@After 和 @BeforeClass 注释。但问题是 @Before 和 @After 在 @BeforeClass 之前执行。这是为什么？

代码:

import junit.runner.Version;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class TestClass2
{
    @BeforeClass
    public static void before() throws Exception
    {
        System.out.println("Before class");
    }

    @Before
    public void setUp() throws Exception
    {
        System.out.println("Before");
    }

    @After
    public void tearDown() throws Exception
    {
        System.out.println("After");

    }

    @Test
    public void name() throws Exception
    {
        System.out.println("Test");
        System.out.println("JUnit version is: " + Version.id());
    }
}

输出:

Before
Test
JUnit version is: 4.12
After
Before class

Process finished with exit code 0

Answer 1

确保将 @BeforeClass 方法声明为 static，并使用 JUnit 的注解(而非 TestNG)。完整代码示例:

import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

/**
 * @author sainnr <p/>27.12.2017.
 */
public class TestClass {

    @BeforeClass
    public static void before() throws Exception {
        System.out.println("Before class");
    }

    @Before
    public void setUp() throws Exception {
        System.out.println("Before");

    }

    @After
    public void tearDown() throws Exception {
        System.out.println("After");

    }

    @Test
    public void name() throws Exception {
        System.out.println("Test");

    }
}

输出:

Before class
Before
Test
After

根据 JUnit 文档:http://junit.sourceforge.net/javadoc/org/junit/BeforeClass.html .