设置Spring单元测试的外部依赖

单元测试中，有时候也依赖外部的组件，比如Redis-Mock。Spring Boot Test需要在上下文启动之前，先启动Redis-Mock，否则上下文会启动失败

依赖的外部组件

比如单元测试中依赖redis-mock，就必须在Spring上下文下载之前就先启动Redis Server，否则就会报下面的错误

io.netty.channel.AbstractChannel$AnnotatedConnectException: 
Connection refused: no further information: localhost/127.0.0.1:6379

方法一：在每个Specification中配置RedisServer

@SpringBootTest
@ActiveProfiles("unittest")
@Transactional
class OrderManagerTest extends Specification {
    private static RedisServer redisServer = null

    def "setupSpec"() {
        try {
            redisServer = RedisServer.newRedisServer()
            redisServer.start()
            System.setProperty("spring.redis.port", Integer.toString(redisServer.getBindPort()))
        } catch (IOException e) {
            throw new RuntimeException(e)
        }
    }

    def "cleanupSpec"() {
        if (redisServer != null) {
            redisServer.stop()
        }
    }
}

更好的方法

上面方法，需要在每个Specification都配置Redis Server，存在大量的冗余。其实可以利用BeanFactoryPostProcessor和ApplicationListener接口实现

import com.github.tenmao.redismock.RedisServer;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ApplicationContextEvent;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.stereotype.Component;

import java.io.IOException;

@Component
public class UnittestCustomContext implements BeanFactoryPostProcessor, ApplicationListener {
    private static RedisServer redisServer = null;

    @Override
    public void onApplicationEvent(ApplicationContextEvent event) {
        if (event instanceof ContextClosedEvent) {
            //Spring上下文结束后清理自定义上下文
            System.out.println("tenmao unit test for event: " + event);
            if (redisServer != null) {
                redisServer.stop();
            }
        }
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        try {
            //Spring上下文初始化之前 配置自定义上下文，也可以修改Spring配置信息
            redisServer = RedisServer.newRedisServer();
            redisServer.start();
            System.setProperty("spring.redis.port", Integer.toString(redisServer.getBindPort()));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}