code: def testFlatten(self, structure):
      generated_type = trace_type.from_value(
          structure,
          trace_type.InternalTracingContext(is_legacy_signature=True),
      )
      flattened = generated_type.flatten()
      self.assertEqual(
          flattened,
          [
              tensor.TensorSpec(None, name="a"),
              tensor.TensorSpec(None, name="b"),
              tensor.TensorSpec(None, name="c"),
          ],
      )
  
imports: import pickle
  from absl.testing import parameterized
  import numpy
  from tensorflow.core.framework import full_type_pb2
  from tensorflow.core.function import trace_type
  from tensorflow.python.eager import context
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.framework import type_spec
  from tensorflow.python.framework.type_utils import fulltypes_for_flat_tensors
  from tensorflow.python.ops import array_ops
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 32 for calling the TensorSpecTest obj's underlying member method code with example usage: obj.testFlatten(structure) without return types