add more IT tests to ease transition to dropwizard 4

commafeed-server/src/test/java/com/commafeed/integration/WebSocketIT.java

@@ -0,0 +1,59 @@
+package com.commafeed.integration;
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+
+import javax.websocket.ClientEndpointConfig;
+import javax.websocket.ContainerProvider;
+import javax.websocket.DeploymentException;
+import javax.websocket.Endpoint;
+import javax.websocket.EndpointConfig;
+import javax.websocket.MessageHandler;
+import javax.websocket.Session;
+
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class WebSocketIT extends BaseIT {
+
+	@Test
+	void subscribeAndGetsNotified() throws DeploymentException, IOException {
+		String sessionId = login();
+		ClientEndpointConfig config = ClientEndpointConfig.Builder.create().configurator(new ClientEndpointConfig.Configurator() {
+			@Override
+			public void beforeRequest(Map<String, List<String>> headers) {
+				headers.put("Cookie", Collections.singletonList("JSESSIONID=" + sessionId));
+			}
+		}).build();
+
+		AtomicBoolean connected = new AtomicBoolean();
+		AtomicReference<String> messageRef = new AtomicReference<>();
+		try (Session ignored = ContainerProvider.getWebSocketContainer().connectToServer(new Endpoint() {
+			@Override
+			public void onOpen(Session session, EndpointConfig config) {
+				session.addMessageHandler(new MessageHandler.Whole<String>() {
+					@Override
+					public void onMessage(String message) {
+						messageRef.set(message);
+					}
+				});
+				connected.set(true);
+			}
+		}, config, URI.create(getWebSocketUrl()))) {
+			Awaitility.await().atMost(15, TimeUnit.SECONDS).untilTrue(connected);
+
+			Long subscriptionId = subscribe(getFeedUrl());
+
+			Awaitility.await().atMost(15, TimeUnit.SECONDS).until(() -> messageRef.get() != null);
+			Assertions.assertEquals("new-feed-entries:" + subscriptionId, messageRef.get());
+		}
+	}
+
+}