docstr: Test that __version__ is valid and normalized.
docstr_tok: ["Test","that","__version__","is","valid","and","normalized","."]
code: def test__version__IsValid(self):
      """Test that __version__ is valid and normalized."""
  
      try:
          import packaging.version
      except ImportError:
          self.skipTest("packaging does not appear to be installed")
  
      self.assertEqual(
          __version__, str(packaging.version.Version(__version__))
      )
  
imports: import unittest
  from markdown.__meta__ import _get_version, __version__
label_desc: Use image node_id 2 for calling the TestVersion obj's underlying member method code with example usage: obj.test__version__IsValid() without return types