code: def test_init(self):
      # Test that the constructor creates an OpSchema object
      schema = defs.OpSchema("test_op", "test_domain", 1)
      self.assertIsInstance(schema, defs.OpSchema)
  
imports: import unittest
  from typing import Sequence
  import parameterized
  import onnx
  from onnx import defs
label_desc: Use image node_id 1 for calling the TestOpSchema obj's underlying member method code with example usage: obj.test_init() without return types