return selector
	}
	if selector.MatchLabels == nil {
		selector.MatchLabels = make(map[string]string)
	}
	selector.MatchLabels[labelKey] = labelValue
	return selector
}

// SelectorHasLabel checks if the given selector contains the given label key in its MatchLabels
func SelectorHasLabel(selector *LabelSelector, labelKey string) bool {
	return len(selector.MatchLabels[labelKey]) > 0

					PodSelector: metav1.LabelSelector{
						MatchLabels: map[string]string{"a": "b"},
					},
					Ingress: []networkingv1.NetworkPolicyIngressRule{
						{
							From: []networkingv1.NetworkPolicyPeer{
								{
									PodSelector: &metav1.LabelSelector{
										MatchLabels: map[string]string{"c": "d"},
									},
									NamespaceSelector: &metav1.LabelSelector{
										MatchLabels: map[string]string{"c": "d"},
									},

        path: /inject
        port: 443
    failurePolicy: Fail
    matchPolicy: Equivalent
    name: rev.namespace.sidecar-injector.istio.io
    namespaceSelector:
      matchLabels:
        istio.io/deactivated: never-match
    objectSelector:
      matchLabels:
        istio.io/deactivated: never-match
    reinvocationPolicy: Never
    rules:
      - apiGroups:
          - ""
        apiVersions:
          - v1

        "time": "2004-01-01T01:01:01Z",
        "fieldsType": "fieldsTypeValue",
        "fieldsV1": {},
        "subresource": "subresourceValue"
      }
    ]
  },
  "spec": {
    "podSelector": {
      "matchLabels": {
        "matchLabelsKey": "matchLabelsValue"
      },
      "matchExpressions": [
        {
          "key": "keyValue",
          "operator": "operatorValue",
          "values": [
            "valuesValue"

        - key: keyValue
          operator: operatorValue
          values:
          - valuesValue
        matchLabels:
          matchLabelsKey: matchLabelsValue
      podSelector:
        matchExpressions:
        - key: keyValue
          operator: operatorValue
          values:
          - valuesValue
        matchLabels:
          matchLabelsKey: matchLabelsValue
  ingress:
  - from:
    - ipBlock:

        "time": "2004-01-01T01:01:01Z",
        "fieldsType": "fieldsTypeValue",
        "fieldsV1": {},
        "subresource": "subresourceValue"
      }
    ]
  },
  "spec": {
    "podSelector": {
      "matchLabels": {
        "matchLabelsKey": "matchLabelsValue"
      },
      "matchExpressions": [
        {
          "key": "keyValue",
          "operator": "operatorValue",
          "values": [
            "valuesValue"

        "time": "2004-01-01T01:01:01Z",
        "fieldsType": "fieldsTypeValue",
        "fieldsV1": {},
        "subresource": "subresourceValue"
      }
    ]
  },
  "spec": {
    "podSelector": {
      "matchLabels": {
        "matchLabelsKey": "matchLabelsValue"
      },
      "matchExpressions": [
        {
          "key": "keyValue",
          "operator": "operatorValue",
          "values": [
            "valuesValue"

	// TODO(madhusudancs): Check if you can use deepCopy_extensions_LabelSelector here.
	newSelector.MatchLabels = make(map[string]string)
	if selector.MatchLabels != nil {
		for key, val := range selector.MatchLabels {
			newSelector.MatchLabels[key] = val
		}
	}
	newSelector.MatchLabels[labelKey] = labelValue

	if selector.MatchExpressions != nil {

		{in: &LabelSelector{}, out: labels.Everything()},
		{
			in:  &LabelSelector{MatchLabels: matchLabels},
			out: mustParse("foo=bar"),
		},
		{
			in:  &LabelSelector{MatchExpressions: matchExpressions},
			out: mustParse("baz in (norf,qux)"),
		},
		{
			in:  &LabelSelector{MatchLabels: matchLabels, MatchExpressions: matchExpressions},
			out: mustParse("baz in (norf,qux),foo=bar"),
		},
		{

            "name": "nameValue",
            "apiVersion": "apiVersionValue"
          },
          "metricName": "metricNameValue",
          "targetValue": "0",
          "selector": {
            "matchLabels": {
              "matchLabelsKey": "matchLabelsValue"
            },
            "matchExpressions": [
              {
                "key": "keyValue",
                "operator": "operatorValue",