code: def test_number_connected_components2(self):
      ncc = nx.number_connected_components
      assert ncc(self.grid) == 1
  
file_path: networkx/networkx/algorithms/components/tests/test_connected.py
imports: import pytest
  import networkx
  from networkx import NetworkXNotImplemented
  from networkx import convert_node_labels_to_integers
  from networkx.classes.tests import dispatch_interface
label_desc: Use image node_id 4 for calling the TestConnected obj's underlying member method code with example usage: obj.test_number_connected_components2() without return types