springboot如何集成单元测试

现在springboot越来越流行，基于springboot的项目，单元测试当然必不可少了。当然基于springboot的项目集成junit做单元测试也是很简单的。

先来看看项目结构：

看看pom.xml，关键是引入spring-boot-starter-test。

<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>cn.lovecto</groupId>
    <artifactId>lovecto</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
    </parent>

    <dependencies>
        <!-- 引入spring-boot-starter -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!-- 引入spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- 引入spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

应用启动类，使用@SpringBootApplication注解：

package cn.lovecto;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

添加一个service，用于测试用：

package cn.lovecto.service;

import org.springframework.stereotype.Service;

@Service
public class TestService {

    /**
     * 系统当前毫秒数
     * @return
     */
    public Long currentTimeMillis(){
        return System.currentTimeMillis();
    }
}

单元测试的时候，只需要在测试类上加上@RunWith注解和@SpringBootTest注解：

package cn.lovecto.service;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import cn.lovecto.Application;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)
public class TestServiceTest {

    @Autowired
    private TestService testService;

    @Test
    public void currentTimeMillis(){
        System.out.println(testService.currentTimeMillis());
    }

}

运行Junit Test，打印出当前的系统毫秒数。