code: def test_init_less_args(self):
      model = MC()
      self.assertListEqual(model.variables, [])
      self.assertDictEqual(model.cardinalities, {})
      self.assertDictEqual(model.transition_models, {})
      self.assertIsNone(model.state)
  
imports: import sys
  import unittest
  import numpy
  from mock import call, patch
  from pandas import DataFrame
  from pgmpy.factors.discrete import State
  from pgmpy.models import MarkovChain
label_desc: Use image node_id 6 for calling the TestMarkovChain obj's underlying member method code with example usage: obj.test_init_less_args() without return types