Java Junit 测试Demo

添加junit pom依赖

scope 为 test

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>spring-zero2hero</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>spring-ioc-03</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>


</project>

编写测试文件

package org.example;


import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.junit.Test;

public class UserServiceTest{

    @Test
    public void applicationTest() {
        // 得到Spring容器上下文环境
        ApplicationContext ac = new ClassPathXmlApplicationContext("spring.xml");
        // userService
        UserService userService = (UserService) ac.getBean("userService");
        userService.test();
    }

    @Test
    public void foo(){
        System.out.println(1);
    }
}

测试类的class 应该为 public , 否则会报以下错误

-------------------------------------------------------------------------------
Test set: org.example.UserServiceTest
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.031 sec <<< FAILURE!
initializationError(org.example.UserServiceTest)  Time elapsed: 0.003 sec  <<< ERROR!
org.junit.runners.model.InvalidTestClassError: Invalid test class 'org.example.UserServiceTest':
  1. The class org.example.UserServiceTest is not public.
  2. Test class should have exactly one public constructor
	at org.junit.runners.ParentRunner.validate(ParentRunner.java:525)
	at org.junit.runners.ParentRunner.<init>(ParentRunner.java:102)
	at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:84)
	at org.junit.runners.JUnit4.<init>(JUnit4.java:23)
	at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:70)
	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:37)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:70)
	at org.junit.internal.requests.ClassRequest.createRunner(ClassRequest.java:28)
	at org.junit.internal.requests.MemoizingRequest.getRunner(MemoizingRequest.java:19)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:250)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)