@Test
public void testEmptyDatapointSet() {

	
	Transform propagateTransform = new PropagateTransform();
	
	Metric metric = new Metric(TEST_SCOPE, TEST_METRIC);
    metric.setDatapoints(Collections.<Long, Double> emptyMap());
    List<Metric> metrics = Arrays.asList(metric);
    List<String> constants = Arrays.asList("1m");
    
    List<Metric> result = propagateTransform.transform(null, metrics, constants);
    assertEquals(metrics, result);
}