code: def test_type_promotion(self):
      test_cases = [
          (20, int, 20),  # No promotion necessary: int => int
          (20, float, 20.0),  # Promotion: int => float
          (20.0, float, 20.0),  # No Promotion necessary: float => float
          (
              "Test text1",
              bytes,
              b"Test text1",
          ),  # Promotion: str => bytes
          (b"Test text1", str, "Test text1"),  # Promotion: bytes => str
      ]
  
      for value_from, type_to, value_to in test_cases:
          if type_to == int:
              fieldType = Integer()
          elif type_to == float:
              fieldType = Double()
          elif type_to == str:
              fieldType = String()
          elif type_to == bytes:
              fieldType = Bytes()
          else:
              fieldType = String()
  
          field_value = fieldType.validate_type(
              "test_field", value_from
          )
          self.assertEqual(value_to, field_value)
  
imports: import math
  import logging
  import requests
  from typing import List
  from unittest import TestCase, main
  import fastavro
  import pulsar
  from pulsar.schema import *
  from enum import Enum
  import json
  from fastavro.schema import load_schema
label_desc: Use image node_id 2 for calling the SchemaTest obj's underlying member method code with example usage: obj.test_type_promotion() without return types