code: def testTransformedNames(self):
      names = ["f1", "cf"]
      self.assertEqual(
          ["f1_xf", "cf_xf"], features.transformed_names(names)
      )
  
imports: import tensorflow
  from tfx.experimental.templates.taxi.models import features
label_desc: Use image node_id 2 for calling the FeaturesTest obj's underlying member method code with example usage: obj.testTransformedNames() without return types