// Build 2nd Matrix.
  float vals2[] = {5.0f, 6.0f, 7.0f, 8.0f};
  TFE_TensorHandle* t2 =
      TestMatrixTensorHandleWithInput(eager_ctx, vals2, dims, num_dims);

  TF_AbstractTensor* at2 = TF_CreateAbstractTensorFromEagerTensor(
      t2, status.get());  // get abstract tensor
  ASSERT_EQ(TF_OK, TF_GetCode(status.get())) << TF_Message(status.get());

  TFE_TensorHandle* t1 = TestMatrixTensorHandle(ctx);
  TFE_TensorHandle* t2 = TestAxisTensorHandle(ctx);
  TFE_Op* assertOp = TFE_NewOp(ctx, "Assert", status);
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  TFE_OpAddInput(assertOp, condition, status);
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  TFE_TensorHandle* data[] = {condition, t1, t2};
  TFE_OpAddInputList(assertOp, data, 3, status);