code: def test_init(self):
      h = [5, 4, 3, 2, 1, 0]
      q = MappedQueue(h)
      self._check_map(q)
  
imports: import pytest
  from networkx.utils.mapped_queue import MappedQueue, _HeapElement
label_desc: Use image node_id 5 for calling the TestMappedQueue obj's underlying member method code with example usage: obj.test_init() without return types