message: Expand composites in tf.test.TestCase.evaluate.
  This is helpful to allow CompositeTensors to be used with tf.test.TestCase.evaluate.
diff: @@ -2128,7 +2128,9 @@ class TensorFlowTestCase(googletest.TestCase):
  values=tensor.values.numpy(),
  indices=tensor.indices.numpy(),
  dense_shape=tensor.dense_shape.numpy())
  - return tensor.numpy()
  + # Convert tensors and composite tensors to numpy arrays.
  + return nest.map_structure(lambda t: t.numpy(), tensor,
  + expand_composites=True)
  except AttributeError as e:
  six.raise_from(ValueError("Unsupported type %s." % type(tensor)), e)
  