【JUnit】JUnit 执行顺序
环境
- JDK 6
- JUnit 4.13
- Spring Tool Suite 4.6.2
- Maven 3.6.3
Test Fixture
Test Fixture 是官方给出的一个概念，原文如下：
A test fixture is a fixed state of a set of objects used as a baseline for running tests.
The purpose of a test fixture is to ensure that there is a well known and fixed environment
in which tests are run so that results are repeatable.
也就是通过一些注解，参与到 JUnit 执行的过程中去，比如在每个测试类运行前执行一段逻辑。
顺序注解
可以参与到执行过程中的注解一共有四个，分别是：
- @BeforeClass：在当前测试类的所有测试执行之前执行，比 @Before 更早执行。
- @AfterClass：在当前测试类的所有测试执行之后执行，比 @After 更晚执行。
- @Before：在每个测试方法执行前执行。
- @After：在每个测试方法执行后执行。
JUnit 执行顺序示例
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>jiangbo.java.junit</groupId>
<artifactId>02-java-junit-test-fixture</artifactId>
<version>1.0.0</version>
<description>JUnit 执行过程示例</description>
<properties>
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.target>1.6</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
Caculator
package jiangbo.java.junit;
public class Caculator {
public static int add(int number1, int number2) {
return number1 + number2;
}
public static int subtract(int number1, int number2) {
return number1 - number2;
}
}
CaculatorTest
package jiangbo.java.junit;
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
public class CaculatorTest {
@Test
public void testAdd() {
System.out.println("testAdd");
int number = Caculator.add(1, 1);
assertEquals(2, number);
}
@Test
public void testSubtract() {
System.out.println("testSubtract");
int number = Caculator.subtract(1, 1);
assertEquals(0, number);
}
@BeforeClass
public static void setUpClass() {
System.out.println("BeforeClass");
}
@AfterClass
public static void tearDownClass() throws IOException {
System.out.println("@AfterClass");
}
@Before
public void setUp() {
System.out.println("@Before");
}
@After
public void tearDown() throws IOException {
System.out.println("@After");
}
}
运行
通过运行单元测试，控制台输出：
BeforeClass
@Before
testAdd
@After
@Before
testSubtract
@After
@AfterClass
