code: def testIsMaximal(self):
      self.assertTrue(self.matching.is_maximal())
      self.matching.matching[0] = -1
      self.matching.matching[12] = -1
      self.assertFalse(self.matching.is_maximal())
  
file_path: python-igraph/tests/test_matching.py
imports: import unittest
  from igraph import Graph, InternalError, Matching
label_desc: Use image node_id 2 for calling the MatchingTests obj's underlying member method code with example usage: obj.testIsMaximal() without return types