Add tests for Contacts, Video, and Sockets to hellocodenameone

This commit introduces three new test classes to `scripts/hellocodenameone` to improve test coverage on device farms:
1. `ContactsTest`: Verifies `ContactsManager.getContacts` functionality.
2. `VideoPlaybackTest`: Verifies `MediaManager.createMedia` with video playback.
3. `SocketTest`: Verifies raw `Socket` connections.

These tests are designed to be minimal, Java 8 compatible, and use the existing `BaseTest` infrastructure. They are registered in `Cn1ssDeviceRunner`.

Author: google-labs-jules[bot]

scripts/hellocodenameone/common/src/main/java/com/codenameone/examples/hellocodenameone/tests/ContactsTest.java

@@ -1,5 +1,6 @@
 package com.codenameone.examples.hellocodenameone.tests;
 
+import com.codename1.contacts.Contact;
 import com.codename1.contacts.ContactsManager;
 import com.codename1.ui.Display;
 import com.codename1.ui.Form;
@@ -17,7 +18,7 @@ public boolean runTest() throws Exception {
         new Thread(() -> {
             try {
                 // Requesting only IDs to be minimal and reduce permission friction where possible
-                String[] contacts = ContactsManager.getContacts(false, false, false, false, false, false);
+                Contact[] contacts = ContactsManager.getContacts(false, false, false, false, false, false);
                 Display.getInstance().callSerially(() -> {
                     if (contacts == null) {
                         status.setText("Contacts access denied or returned null");

scripts/hellocodenameone/common/src/main/java/com/codenameone/examples/hellocodenameone/tests/SocketTest.java

@@ -41,8 +41,26 @@ public void connectionEstablished(InputStream is, OutputStream os) {
                 try {
                     os.write("GET / HTTP/1.1\r\nHost: google.com\r\n\r\n".getBytes());
                     os.flush();
+
+                    // Simple read to verify basic connectivity
+                    byte[] buffer = new byte[128];
+                    int read = is.read(buffer);
+                    if (read > 0) {
+                         Display.getInstance().callSerially(() -> {
+                             status.setText("Data received: " + read + " bytes. Success.");
+                             form.revalidate();
+                             done();
+                        });
+                    } else {
+                        Display.getInstance().callSerially(() -> {
+                             fail("Read 0 or -1 bytes from socket.");
+                        });
+                    }
+
                 } catch (Exception e) {
-                    fail("Write failed: " + e.getMessage());
+                    Display.getInstance().callSerially(() -> {
+                        fail("Write/Read failed: " + e.getMessage());
+                    });
                 }
             }
 
@@ -52,18 +70,6 @@ public void connectionError(int errorCode, String message) {
                     fail("Connection error: " + message);
                 });
             }
-
-            @Override
-            public void messageReceived(InputStream is, OutputStream os) {
-                // We received something, that's enough for coverage
-                Display.getInstance().callSerially(() -> {
-                     status.setText("Message received. Success.");
-                     form.revalidate();
-                     done();
-                });
-                // We do not assume we can close the socket gracefully here easily as SocketConnection
-                // is managed by the implementation.
-            }
         });
 
         return true;