// Try to retrieve lengths before building the attributes (should fail)
  EXPECT_EQ(-1, TFE_OpGetInputLength(identityOp, "input", status));
  CHECK_NE(TF_OK, TF_GetCode(status)) << TF_Message(status);
  EXPECT_EQ(-1, TFE_OpGetOutputLength(identityOp, "output", status));
  CHECK_NE(TF_OK, TF_GetCode(status)) << TF_Message(status);

  TFE_TensorHandle* inputs[] = {input1, input2};
  TFE_OpAddInputList(identityOp, inputs, 2, status);