code: def test_unary_transformer_validate_input_type(self):
      shiftVal = 3
      transformer = (
          MockUnaryTransformer(shiftVal=shiftVal)
          .setInputCol("input")
          .setOutputCol("output")
      )
  
      # should not raise any errors
      transformer.validateInputType(DoubleType())
  
      with self.assertRaises(TypeError):
          # passing the wrong input type should raise an error
          transformer.validateInputType(IntegerType())
  
file_path: spark/python/pyspark/ml/tests/test_base.py
imports: import unittest
  from pyspark.sql.types import DoubleType, IntegerType
  from pyspark.testing.mlutils import MockDataset, MockEstimator, MockUnaryTransformer, MockTransformer, SparkSessionTestCase
label_desc: Use image node_id 1 for calling the UnaryTransformerTests obj's underlying member method code with example usage: obj.test_unary_transformer_validate_input_type() without return types