diff -r b43aaf398748 -r e8916518b38d javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/KnockoutTest.java
--- a/javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/KnockoutTest.java	Thu Apr 04 11:45:54 2013 +0200
+++ b/javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/KnockoutTest.java	Thu Apr 04 13:08:26 2013 +0200
@@ -27,7 +27,9 @@
 import org.apidesign.bck2brwsr.vmtest.BrwsrTest;
 import org.apidesign.bck2brwsr.vmtest.HtmlFragment;
 import org.apidesign.bck2brwsr.vmtest.VMTest;
+import static org.testng.Assert.assertEquals;
 import org.testng.annotations.Factory;
+import org.testng.annotations.Test;
 
 /**
  *
@@ -181,6 +183,28 @@
 
         assert first.getSex() == Sex.FEMALE : "Transverted to female: " + first.getSex();
     }
+    
+    @Test public void cloneModel() {
+        Person model = new Person();
+        
+        model.setFirstName("first");
+        Person snd = model.clone();
+        snd.setFirstName("clone");
+        assertEquals("first", model.getFirstName(), "Value has not changed");
+        assertEquals("clone", snd.getFirstName(), "Value has changed in clone");
+    }
+   
+    
+    @Test public void deepCopyOnClone() {
+        People model = new People();
+        model.getNicknames().add("Jarda");
+        assertEquals(model.getNicknames().size(), 1, "One element");
+        People snd = model.clone();
+        snd.getNicknames().clear();
+        assertEquals(snd.getNicknames().size(), 0, "Clone is empty");
+        assertEquals(model.getNicknames().size(), 1, "Still one element");
+    }
+    
      
     @OnFunction
     static void call(KnockoutModel m, String data) {