code: def test_remove_root(self):
      h = [0, 2, 1, 6, 3, 5, 4]
      h_removed = [1, 2, 4, 6, 3, 5]
      q = self._make_mapped_queue(h)
      removed = q.remove(0)
      assert q.heap == h_removed
  
imports: import pytest
  from networkx.utils.mapped_queue import MappedQueue, _HeapElement
label_desc: Use image node_id 20 for calling the TestMappedQueue obj's underlying member method code with example usage: obj.test_remove_root() without return types