Add unit test to Message.context field handling

Author: tmoreira2020

src/test/java/com/whatsapp/api/domain/messages/MessageTest.java

@@ -0,0 +1,33 @@
+package com.whatsapp.api.domain.messages;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.jupiter.api.Test;
+
+public class MessageTest {
+
+    @Test
+    public void testMessageBuilderWithContext() {
+        String messageId = "wamid.HBgNNTUyNzk5NzAzMDkzNhUCABIYFDNBRjE2OTUyOTNCNTlCM0IzRDQ0AA==";
+        Context context = new Context();
+        context.setMessageId(messageId);
+
+        Message message = Message.MessageBuilder.builder()
+                .setTo("123456789")
+                .setContext(context)
+                .buildTextMessage(new TextMessage());
+
+        assertNotNull(message.getContext(), "Context should not be null");
+        assertEquals(messageId, message.getContext().getMessageId(), "Context field value mismatch");
+    }
+
+    @Test
+    public void testMessageWithoutContext() {
+        Message message = Message.MessageBuilder.builder()
+                .setTo("123456789")
+                .buildTextMessage(new TextMessage());
+
+        assertEquals(null, message.getContext(), "Context should be null");
+    }
+}