return set1.isEmpty() && set2.isEmpty();
      }

      @Override
      public UnmodifiableIterator<E> iterator() {
        return new AbstractIterator<E>() {
          final Iterator<? extends E> itr1 = set1.iterator();
          final Iterator<? extends E> itr2 = set2.iterator();

          @Override
          @CheckForNull
          protected E computeNext() {
            if (itr1.hasNext()) {

    }
    try {
      Iterator<Integer> iterator = unmod.iterator();
      iterator.next();
      iterator.remove();
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      Iterator<Integer> iterator = unmod.descendingIterator();
      iterator.next();
      iterator.remove();

resources: ["pods"] failurePolicy: Fail admissionReviewVersi: ["v1beta1", "v1"] namespaceSelector: matchExpressions: - key: istio-injection operator: DoesNotExist - key: istio.io/rev operator: In values: - 1-8-6 --- apiVersion: apps/v1 kind: Deployment metadata: labels: app: istiod install.operator.istio.io/owning-resource: unknown istio: pilot istio.io/rev: 1-8-6 operator.istio.io/component: Pilot release: istio name: istiod-1-8-6 namespace: istio-system spec: selector: matchLabels: app: istiod istio.io/rev:...

							{
								ScopeName: corev1.ResourceQuotaScopeBestEffort,
								Operator:  corev1.ScopeSelectorOpExists,
							},
						},
					},
					{
						Resource: "pods",
						MatchScopes: []corev1.ScopedResourceSelectorRequirement{
							{
								ScopeName: corev1.ResourceQuotaScopePriorityClass,
								Operator:  corev1.ScopeSelectorOpIn,
								Values:    []string{"cluster-services"},
							},

        addToContainer(b)
        addToContainer(a)
        addToContainer(c)

        expect:
        def seen = []
        def iterator = container.iterator()
        seen << iterator.next()
        seen << iterator.next()
        seen << iterator.next()
        !iterator.hasNext()
        seen == iterationOrder(b, a, c)
    }

["v1beta1", "v1"] namespaceSelector: matchExpressions: - key: istio.io/rev operator: DoesNotExist - key: istio-injection operator: DoesNotExist objectSelector: matchExpressions: - key: sidecar.istio.io/inject operator: NotIn values: - "false" - key: istio.io/rev operator: In values: - "1-10-0" --- apiVersion: apps/v1 kind: Deployment metadata: name: istiod-1-10-0 namespace: istio-system labels: app: istiod istio.io/rev: 1-10-0 install.operator.istio.io/owning-resource: unknown operator.istio.io/component: "Pilot"...

					{
						LabelSelector: &metav1.LabelSelector{
							MatchExpressions: []metav1.LabelSelectorRequirement{
								{
									Key:      "service",
									Operator: metav1.LabelSelectorOpExists,
								}, {
									Key:      "wrongkey",
									Operator: metav1.LabelSelectorOpDoesNotExist,
								},
							},
						},
						TopologyKey: "region",
					}, {
						LabelSelector: &metav1.LabelSelector{

["v1beta1", "v1"] namespaceSelector: matchExpressions: - key: istio-injection operator: DoesNotExist - key: istio.io/rev operator: In values: - 1-9-5 objectSelector: matchExpressions: - key: "sidecar.istio.io/inject" operator: NotIn values: - "false" --- apiVersion: apps/v1 kind: Deployment metadata: name: istiod-1-9-5 namespace: istio-system labels: app: istiod istio.io/rev: 1-9-5 install.operator.istio.io/owning-resource: unknown operator.istio.io/component: "Pilot" istio: pilot release: istio spec: strategy:...

    }
    try {
      Iterator<String> iterator = values.iterator();
      iterator.next();
      iterator.remove();
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }

    Set<Entry<Integer, String>> entries = unmod.entrySet();
    try {
      Iterator<Entry<Integer, String>> iterator = entries.iterator();
      iterator.next();

        given:
        registry.register("foo") { it.descriptor("foo creator").unmanaged(String, "other", null, Stub(Transformer)) }

        when:
        registry.realize("foo")

        then:
        UnboundModelRulesException e = thrown()
        normaliseLineSeparators(e.message).contains '''
  foo creator
    inputs:
      - other Object [*]
'''
    }