def METHOD_NAME(self):
    n0 = moosetree.Node(None, 'root')
    n1 = moosetree.Node(n0, 'n1')
    n2 = moosetree.Node(None, 'n2')
    self.assertEqual(n0.children, [n1])
    n0.insert(0, n2)
    self.assertEqual(n0.children, [n2, n1])
    self.assertIs(n2.parent, n0)