def test_compact_to(self):
n = Node()
n['a'] = 1
n['b'] = 2
n['c'] = 3
ni = n.info()
self.assertEqual(ni["mem_spaces"].number_of_children(), 3)
n2 = Node()
n.compact_to(n2)
ni = n2.info()
print(ni)
self.assertEqual(ni["mem_spaces"].number_of_children(), 1)
