}
	manifest.MediaType = types.DockerManifestSchema2

	// Push image to the registry.
	err = crane.Push(img, ref, fetchOpt)
	if err != nil {
		t.Fatal(err)
	}

	// Push image to the registry with latest tag as well
	ref = fmt.Sprintf("%s/test/valid/docker:latest", host)
	err = crane.Push(img, ref, fetchOpt)
	if err != nil {
		t.Fatal(err)
	}

	// Calculate sum
	d, _ := img.Digest()

    BlockArgument main_arg = main_func_op.getArgument(main_arg_idx);
    mapper.map(src_arg, main_arg);
  }

  return mapper;
}

// Copies ops from `src_func_op` to `main_body` except for the FetchOps. Returns
// the fetch values in the main GraphOp corresponding to the original fetch
// values from `src_func_op`. Returns an empty vector when `src_func_op` is
// empty. `main_func_op` must have a GraphOp.