Fix the build

lib3270j/src/test/java/haus/nightmare/lib3270j/integration/LiveHostHeadlessTest.java

@@ -54,11 +54,12 @@ public class LiveHostHeadlessTest {
 
         CountDownLatch connectedLatch = new CountDownLatch(1);
         CountDownLatch screenLatch = new CountDownLatch(1);
+        java.util.concurrent.atomic.AtomicReference<String> screenContentRef = new java.util.concurrent.atomic.AtomicReference<>();
 
         client.addConnectionListener(new ConnectionListener() {
             @Override
             public void onConnectionStateChanged(ConnectionState oldState, ConnectionState newState) {
-                if (newState == ConnectionState.CONNECTED_3270) {
+                if (newState.is3270()) {
                     connectedLatch.countDown();
                 }
             }
@@ -72,29 +73,32 @@ public class LiveHostHeadlessTest {
             public void onScreenUpdated() {
                 ScreenBuffer sb = client.getScreenBuffer();
                 if (sb != null && sb.isFormatted()) {
+                    String text = sb.getText().trim();
+                    if (!text.isEmpty()) {
+                        screenContentRef.set(text);
                         screenLatch.countDown();
                     }
                 }
+            }
         });
 
         try {
             client.connect();
 
-            boolean connected = connectedLatch.await(5, TimeUnit.SECONDS);
-            assertTrue(connected, "Client must establish CONNECTED_3270 state");
+            boolean connected = connectedLatch.await(8, TimeUnit.SECONDS);
+            assertTrue(connected, "Client must establish 3270 connected state");
 
-            boolean screenReceived = screenLatch.await(5, TimeUnit.SECONDS);
+            boolean screenReceived = screenLatch.await(8, TimeUnit.SECONDS);
             assertTrue(screenReceived, "Client must receive formatted screen from live MVS host");
 
+            String screenContent = screenContentRef.get();
+            if (screenContent == null || screenContent.isEmpty()) {
                 ScreenBuffer sb = client.getScreenBuffer();
-            assertNotNull(sb);
-
-            StringBuilder fullText = new StringBuilder();
-            for (int i = 0; i < sb.getSize(); i++) {
-                char c = sb.getCell(i).ucs4;
-                fullText.append(c > ' ' ? c : ' ');
+                if (sb != null) {
+                    screenContent = sb.getText().trim();
                 }
-            String screenContent = fullText.toString().trim();
+            }
+            assertNotNull(screenContent, "Screen content should not be null");
             assertFalse(screenContent.isEmpty(), "Screen buffer text should not be empty");
 
             // Verify headless graphics plane is initialized without AWT