Fix failing test

Explicitly pass the client-side JSR-356 WebSocketContainer to the
TomcatWebSocketClient to prevent the ContainerProvider from finding
the one from undertow-websockets-jsr through the ServiceLoader API.

spring-webflux/src/main/java/org/springframework/web/reactive/socket/client/TomcatWebSocketClient.java

@@ -17,6 +17,7 @@
 package org.springframework.web.reactive.socket.client;
 
 import javax.websocket.Session;
+import javax.websocket.WebSocketContainer;
 
 import org.springframework.web.reactive.socket.HandshakeInfo;
 import org.springframework.web.reactive.socket.adapter.StandardWebSocketSession;
@@ -33,6 +34,14 @@ import reactor.core.publisher.MonoProcessor;
 public class TomcatWebSocketClient extends StandardWebSocketClient {
 
 
+	public TomcatWebSocketClient() {
+	}
+
+	public TomcatWebSocketClient(WebSocketContainer webSocketContainer) {
+		super(webSocketContainer);
+	}
+
+
 	@Override
 	protected StandardWebSocketSession createWebSocketSession(Session session,
 			HandshakeInfo info, MonoProcessor<Void> completion) {

spring-webflux/src/test/java/org/springframework/web/reactive/socket/AbstractWebSocketIntegrationTests.java

@@ -21,6 +21,8 @@ import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
 
+import org.apache.tomcat.websocket.WsContainerProvider;
+import org.apache.tomcat.websocket.WsWebSocketContainer;
 import org.apache.tomcat.websocket.server.WsContextListener;
 import org.junit.After;
 import org.junit.Before;
@@ -93,7 +95,7 @@ public abstract class AbstractWebSocketIntegrationTests {
 	public static Object[][] arguments() throws IOException {
 
 		Flux<? extends WebSocketClient> clients = Flux.concat(
-				Flux.just(new TomcatWebSocketClient()).repeat(5),
+				Flux.just(new TomcatWebSocketClient(new WsWebSocketContainer())).repeat(5),
 				Flux.just(new JettyWebSocketClient()).repeat(5),
 				Flux.just(new ReactorNettyWebSocketClient()).repeat(5),
 				Flux.just(new RxNettyWebSocketClient()).repeat(5),