diff --git a/androidgcs/tests/org/openpilot/uavtalk/DataObjectTest.java b/androidgcs/tests/org/openpilot/uavtalk/DataObjectTest.java
new file mode 100644
index 000000000..0f8106cc5
--- /dev/null
+++ b/androidgcs/tests/org/openpilot/uavtalk/DataObjectTest.java
@@ -0,0 +1,95 @@
+package org.openpilot.uavtalk;
+
+import static org.junit.Assert.*;
+
+import java.nio.ByteBuffer;
+import java.util.Observer;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.openpilot.uavtalk.uavobjects.ActuatorCommand;
+import org.openpilot.uavtalk.uavobjects.UAVObjectsInitialize;
+
+import android.database.Observable;
+
+public class DataObjectTest {
+
+ boolean succeed = false;
+
+	@BeforeClass
+	public static void setUpBeforeClass() throws Exception {
+	}
+
+	@Test
+	public void testUpdatedObserver() {
+		
+		succeed = false;
+		
+		UAVObject obj = new ActuatorCommand();
+		obj.addUpdatedObserver( new Observer() {
+
+			public void update(java.util.Observable observable, Object data) {
+				System.out.println("Updated: " + data.toString());				
+				succeed = true;
+			}
+		});
+		obj.updated();
+		
+		if(!succeed)
+			fail("No callback");
+		
+		System.out.println("Done");
+
+	}
+
+	@Test
+	public void testUpdatedViaObjMngr() {
+		succeed = false;
+		
+		UAVObjectManager objMngr = new UAVObjectManager();
+		UAVObjectsInitialize.register(objMngr);
+
+		UAVObject obj = objMngr.getObject("FlightTelemetryStats");
+		obj.addUpdatedObserver( new Observer() {
+
+			public void update(java.util.Observable observable, Object data) {
+				System.out.println("Updated: " + data.toString());				
+				succeed = true;
+			}
+		});
+		objMngr.getObject("FlightTelemetryStats").updated();	
+
+		if(!succeed)
+			fail("No callback");
+		System.out.println("Done");
+
+	}
+	
+	@Test
+	public void testUnpackedViaObjMngr() {
+		succeed = false;
+		
+		UAVObjectManager objMngr = new UAVObjectManager();
+		UAVObjectsInitialize.register(objMngr);
+
+		UAVObject obj = objMngr.getObject("FlightTelemetryStats");
+		obj.addUnpackedObserver( new Observer() {
+
+			public void update(java.util.Observable observable, Object data) {
+				System.out.println("Updated: " + data.toString());				
+				succeed = true;
+			}
+		});
+		
+		ByteBuffer bbuf = ByteBuffer.allocate(obj.getNumBytes());
+		objMngr.getObject("FlightTelemetryStats").unpack(bbuf);
+
+		if(!succeed)
+			fail("No callback");
+
+		System.out.println("Done");
+
+	}
+
+
+}