def test_lookback(self): m = MeiElement("mei") m1 = MeiElement("music") b1 = MeiElement("body") s1 = MeiElement("staff") n1 = MeiElement("note") doc = MeiDocument() doc.setRootElement(m) m.addChild(m1) m1.addChild(b1) b1.addChild(s1) s1.addChild(n1) self.assertEqual(m1.lookBack('mei'), m) self.assertEqual(s1.lookBack('mei'), m)