code: def test_inputs(self):
      # Test that the inputs parameter is optional and is a sequence of FormalParameter tuples
      inputs = [
          defs.OpSchema.FormalParameter(
              name="input1",
              type_str="T",
              description="The first input.",
          )
      ]
      schema = defs.OpSchema(
          "test_op",
          "test_domain",
          1,
          inputs=inputs,
          type_constraints=[("T", ["tensor(int64)"], "")],
      )
  
      self.assertEqual(len(schema.inputs), 1)
      self.assertEqual(schema.inputs[0].name, "input1")
      self.assertEqual(schema.inputs[0].type_str, "T")
      self.assertEqual(schema.inputs[0].description, "The first input.")
  
imports: import unittest
  from typing import Sequence
  import parameterized
  import onnx
  from onnx import defs
label_desc: Use image node_id 9 for calling the TestOpSchema obj's underlying member method code with example usage: obj.test_inputs() without return types