code: def test_quotient_graph_incomplete_partition():
      G = nx.path_graph(6)
      partition = []
      H = nx.quotient_graph(G, partition, relabel=True)
      assert nodes_equal(H.nodes(), [])
      assert edges_equal(H.edges(), [])
  
      partition = [[0, 1], [2, 3], [5]]
      H = nx.quotient_graph(G, partition, relabel=True)
      assert nodes_equal(H.nodes(), [0, 1, 2])
      assert edges_equal(H.edges(), [(0, 1)])
  
imports: import pytest
  import networkx
  from networkx.utils import arbitrary_element, edges_equal, nodes_equal
label_desc: Use image node_id 18 for calling a global function with example usage: test_quotient_graph_incomplete_partition() without return types