springboot整合websocket后运行测试类报错：javax.websocket.server.ServerContainer not available

转载自：https://blog.csdn.net/fggdgh/article/details/87185555

springboot项目添加websocket依赖后运行测试类报如下错误：

解决办法：为SpringbootTest注解指定参数classes和webEnvironment

@SpringBootTest(classes = WebsocketServerTestApplication.class, webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)

因为WebSocket是servlet容器所支持的，所以需要加载servlet容器：
webEnvironment参数为springboot指定ApplicationContext类型。
webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT表示内嵌的服务器将会在一个随机的端口启动。
webEnvironment 主要的值可以参考SpringbootTest源码：

/**
     * An enumeration web environment modes.
     */
    enum WebEnvironment {

        /**
         * Creates a {@link WebApplicationContext} with a mock servlet environment if
         * servlet APIs are on the classpath, a {@link ReactiveWebApplicationContext} if
         * Spring WebFlux is on the classpath or a regular {@link ApplicationContext}
         * otherwise.
         */
        MOCK(false),

        /**
         * Creates a web application context (reactive or servlet based) and sets a
         * {@code server.port=0} {@link Environment} property (which usually triggers
         * listening on a random port). Often used in conjunction with a
         * {@link LocalServerPort} injected field on the test.
         */
        RANDOM_PORT(true),

        /**
         * Creates a (reactive) web application context without defining any
         * {@code server.port=0} {@link Environment} property.
         */
        DEFINED_PORT(true),

        /**
         * Creates an {@link ApplicationContext} and sets
         * {@link SpringApplication#setWebApplicationType(WebApplicationType)} to
         * {@link WebApplicationType#NONE}.
         */
        NONE(false);

        private final boolean embedded;

        WebEnvironment(boolean embedded) {
            this.embedded = embedded;
        }

        /**
         * Return if the environment uses an {@link ServletWebServerApplicationContext}.
         * @return if an {@link ServletWebServerApplicationContext} is used.
         */
        public boolean isEmbedded() {
            return this.embedded;
        }

    }