code: def test_empty_pop(self):
      q = MappedQueue()
      pytest.raises(IndexError, q.pop)
  
imports: import pytest
  from networkx.utils.mapped_queue import MappedQueue, _HeapElement
label_desc: Use image node_id 5 for calling the TestMappedDict obj's underlying member method code with example usage: obj.test_empty_pop() without return types