code: def test_k_crust_multigraph(self):
      core_number = nx.core_number(self.H)
      H = nx.MultiGraph(self.H)
      with pytest.deprecated_call():
          nx.k_crust(H, k=0, core_number=core_number)
  
imports: import pytest
  import networkx
  from networkx.utils import nodes_equal
label_desc: Use image node_id 13 for calling the TestCore obj's underlying member method code with example usage: obj.test_k_crust_multigraph() without return types