return &kubeadmapi.InitConfiguration{
		ClusterConfiguration: kubeadmapi.ClusterConfiguration{
			KubernetesVersion: "v1.0.1",
		},
	}, nil
}

func TestRunDiff(t *testing.T) {
	// create a temporary file with valid ClusterConfiguration
	testUpgradeDiffConfigContents := []byte(fmt.Sprintf(`
apiVersion: %s
kind: UpgradeConfiguration
diff: