code: def test_communicability(self):
      answer = {
          0: {0: 1.5430806348152435, 1: 1.1752011936438012},
          1: {0: 1.1752011936438012, 1: 1.5430806348152435},
      }
      #        answer={(0, 0): 1.5430806348152435,
      #                (0, 1): 1.1752011936438012,
      #                (1, 0): 1.1752011936438012,
      #                (1, 1): 1.5430806348152435}
  
      result = communicability(nx.path_graph(2))
      for k1, val in result.items():
          for k2 in val:
              assert answer[k1][k2] == pytest.approx(
                  result[k1][k2], abs=1e-7
              )
  
imports: from collections import defaultdict
  import pytest
  import networkx
  from networkx.algorithms.communicability_alg import communicability, communicability_exp
label_desc: Use image node_id 1 for calling the TestCommunicability obj's underlying member method code with example usage: obj.test_communicability() without return types