code: def tests_minimum_st_node_cut():
      G = nx.Graph()
      G.add_nodes_from([0, 1, 2, 3, 7, 8, 11, 12])
      G.add_edges_from([(7, 11), (1, 11), (1, 12), (12, 8), (0, 1)])
      nodelist = minimum_st_node_cut(G, 7, 11)
      assert nodelist == {}
  
imports: import pytest
  import networkx
  from networkx.algorithms import flow
  from networkx.algorithms.connectivity import minimum_st_edge_cut, minimum_st_node_cut
  from networkx.utils import arbitrary_element
label_desc: Use image node_id 19 for calling a global function with example usage: tests_minimum_st_node_cut() without return types