@Test
public void testAddInstance_root_duplicate() throws Exception {

	Assert.assertEquals( 2, this.app.getRootInstances().size());
	Instance existingInstance = new Instance( this.app.getMySqlVm().getName()).component( this.app.getMySqlVm().getComponent());
	Response resp = this.resource.addInstance( this.app.getName(), null, existingInstance );
	Assert.assertEquals( Status.FORBIDDEN.getStatusCode(), resp.getStatus());
}