@Bean
    public RouterFunction<ServerResponse> monoRouterFunction(final ShenyuTestHttpRouter shenyuTestHttpRouter) {
        return shenyuTestHttpRouter.routes();
    }
define a bean with name monoRouterFunction for test.

@param shenyuTestHttpRouter shenyuTestHttpRouter
@return route functions
shenyu-examples/shenyu-examples-http-swagger3/src/main/java/org/apache/shenyu/examples/http/config/HttpServerConfig.java