code: def testInvalidCommandSpec(self):
      with self.assertRaises(Exception):
          _x = CommandSpec()
  
      with self.assertRaises(Exception):
          _x = CommandSpec(description=None)
  
      with self.assertRaises(Exception):
          _x = CommandSpec(description=3)
  
file_path: nupic-legacy/tests/unit/nupic/regions/regions_spec_test.py
imports: import unittest2
  from nupic.regions.spec import Spec, InputSpec, OutputSpec, ParameterSpec, CommandSpec
label_desc: Use image node_id 7 for calling the KNNAnomalyClassifierRegionTest obj's underlying member method code with example usage: obj.testInvalidCommandSpec() without return types