Re-enable Undertow tests in WebSocketConfigurationIT

spring-websocket/src/test/java/org/springframework/web/socket/config/annotation/WebSocketConfigurationTests.java

@@ -28,10 +28,7 @@ import org.junit.runners.Parameterized.Parameters;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.web.socket.AbstractWebSocketIntegrationTests;
-import org.springframework.web.socket.JettyWebSocketTestServer;
-import org.springframework.web.socket.TomcatWebSocketTestServer;
-import org.springframework.web.socket.WebSocketSession;
+import org.springframework.web.socket.*;
 import org.springframework.web.socket.client.jetty.JettyWebSocketClient;
 import org.springframework.web.socket.client.standard.StandardWebSocketClient;
 import org.springframework.web.socket.handler.AbstractWebSocketHandler;
@@ -52,9 +49,8 @@ public class WebSocketConfigurationTests extends AbstractWebSocketIntegrationTes
 	public static Iterable<Object[]> arguments() {
 		return Arrays.asList(new Object[][] {
 				{new JettyWebSocketTestServer(), new JettyWebSocketClient()},
-				{new TomcatWebSocketTestServer(), new StandardWebSocketClient()}
-				// {new UndertowTestServer(), new StandardWebSocketClient()}
-				// TODO: Undertow tests fail against OpenJDK 8 build 124 with a BindException
+				{new TomcatWebSocketTestServer(), new StandardWebSocketClient()},
+				{new UndertowTestServer(), new StandardWebSocketClient()}
 		});
 	}