求助 laravel 单元测试连接数据库出错

当我直接调用接口时没有报错，当我运行需要连接数据库的单元测试的时候报如下错误
Illuminate\Database\QueryException: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name does not resolve (SQL: select * from litemall_user where username = tanfan1 and deleted = 0 limit 1) in file

我的php环境 和 mysql 环境是使用docker 独立部署

phpunit.xml设置如下

        <server name="APP_ENV" value="testing"/>
        <server name="BCRYPT_ROUNDS" value="4"/>
        <server name="CACHE_DRIVER" value="array"/>
        <server name="DB_CONNECTION" value="mysql"/>
        <server name="DB_DATABASE" value="litemall"/>
        <server name="MAIL_DRIVER" value="array"/>
        <server name="QUEUE_CONNECTION" value="sync"/>
        <server name="SESSION_DRIVER" value="array"/>

.env 数据库配置如下

DB_CONNECTION=mysql
DB_HOST=mysql
DB_PORT=3306
DB_DATABASE=litemall
DB_USERNAME=root
DB_PASSWORD=tjh2692992