code: def testOpCreate_ReturnsOp(self):
      result = Foo.create(foo=42)
      self.assertIsInstance(result, Foo)
      self.assertEqual(result.foo, 42)
  
imports: import copy
  from typing import Optional, Mapping, Set
  import tensorflow
  from tfx.dsl.input_resolution import resolver_op
  import tfx.types
  from tfx.types import standard_artifacts
label_desc: Use image node_id 6 for calling the ResolverOpTest obj's underlying member method code with example usage: obj.testOpCreate_ReturnsOp() without return types