public void testIsAncestor() {
// System.err.println(graph.toString(CoreLabel.VALUE_TAG_INDEX_FORMAT));
assertEquals(1, graph.isAncestor(graph.getNodeByIndex(42), graph.getNodeByIndex(45)));
assertEquals(2, graph.isAncestor(graph.getNodeByIndex(40), graph.getNodeByIndex(37)));
assertEquals(-1, graph.isAncestor(graph.getNodeByIndex(40), graph.getNodeByIndex(38)));
assertEquals(-1, graph.isAncestor(graph.getNodeByIndex(40), graph.getNodeByIndex(10)));
assertEquals(-1, graph.isAncestor(graph.getNodeByIndex(45), graph.getNodeByIndex(42)));
}
