Spring Boot加入websocket后 单元测试报错（javax.websocket.server.ServerContainer not available）

错误提示:

Caused by: java.lang.IllegalStateException: javax.websocket.server.ServerContainer not available

at org.springframework.util.Assert.state(Assert.java:76)

at org.springframework.web.socket.server.standard.ServerEndpointExporter.afterPropertiesSet(ServerEndpointExporter.java:107)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1853)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1790)

… 41 more

解决：

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)

在springbootTest注解加入 webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT

这个注解的意思是：

If you need to start a full running server, we recommend that you use random ports. If you use @SpringBootTest(webEnvironment=WebEnvironment.RANDOM_PORT), an available port is picked at random each time your test runs.

大致意思是：我们在测试使用websocket的时候需要启动一个完整的服务器，而使用这个注解就是说每次测试都会选用一个随即可用的端口模拟启动一个完整的服务器，此时问题完美解决!!