code: def test_bad_input(self):
      class NotAString:
          pass
  
      msg = "import_item accepts strings, not '%s'." % NotAString
      with self.assertRaisesRegex(TypeError, msg):
          import_item(NotAString())
  
imports: import os
  from unittest import TestCase
  from traitlets.utils.importstring import import_item
label_desc: Use image node_id 2 for calling the TestImportItem obj's underlying member method code with example usage: obj.test_bad_input() without return types