code: def testOutput(self, output_signature):
      generated_type = function_type.from_structured_signature(
          ((), {}), output_signature
      )
      self.assertEqual(
          generated_type.output,
          trace_type.from_value(
              output_signature,
              trace_type.InternalTracingContext(
                  is_legacy_signature=True
              ),
          ),
      )
  
imports: import collections
  import pickle
  import platform
  from absl.testing import parameterized
  from tensorflow.core.function import trace_type
  from tensorflow.core.function.polymorphism import function_type
  from tensorflow.core.function.polymorphism import function_type_pb2
  from tensorflow.core.function.trace_type import serialization
  from tensorflow.python.framework import func_graph
  from tensorflow.python.platform import test
  from tensorflow.python.types import trace
label_desc: Use image node_id 3 for calling the FromStructuredSignatureTest obj's underlying member method code with example usage: obj.testOutput(output_signature) without return types