code: def test_clean_strings(self):
      clean_ops = [
          str.strip,
          TransformUtil.remove_punctuation,
          str.title,
      ]
      output = TransformUtil.clean_strings(self.states, clean_ops)
      assert_equal(output, self.expected_output)
  
imports: from nose.tools import assert_equal
  from ..transform_util import TransformUtil
label_desc: Use image node_id 3 for calling the TestTransformUtil obj's underlying member method code with example usage: obj.test_clean_strings() without return types