var slice []error
	var agg Aggregate
	var err error

	agg = NewAggregate(slice)
	if agg != nil {
		t.Errorf("expected nil, got %#v", agg)
	}
	err = NewAggregate(slice)
	if err != nil {
		t.Errorf("expected nil, got %#v", err)
	}

	// This is not normally possible, but pedantry demands I test it.
	agg = aggregate(slice) // empty aggregate
	if s := agg.Error(); s != "" {

        given:
        AnyDaemonExpirationStrategy agg = new AnyDaemonExpirationStrategy([c1, c2])

        when:
        1 * c1.checkExpiration() >> { new DaemonExpirationResult(c1Status, "r1") }
        1 * c2.checkExpiration() >> { new DaemonExpirationResult(c2Status, "r2") }

        then:
        DaemonExpirationResult result = agg.checkExpiration()
        result.status == anyStatus

type aggregate []error

// Error is part of the error interface.
func (agg aggregate) Error() string {
	if len(agg) == 0 {
		// This should never happen, really.
		return ""
	}
	if len(agg) == 1 {
		return agg[0].Error()
	}
	seenerrs := sets.NewString()
	result := ""
	agg.visit(func(err error) bool {
		msg := err.Error()
		if seenerrs.Has(msg) {
			return false
		}

        when:
        AllDaemonExpirationStrategy agg = new AllDaemonExpirationStrategy(Collections.emptyList())

        then:
        DaemonExpirationResult result = agg.checkExpiration()
        result.status == DO_NOT_EXPIRE
        result.reason == null
    }

    def "doesn't concatenate a null reason"() {
        given:
        AllDaemonExpirationStrategy agg = new AllDaemonExpirationStrategy([c1, c2])

        when:

		// Authorization will always use the proxy cluster.
		agg.controllers = append(agg.controllers, *cc)
	}
	if cc := m.component.ForCluster(m.configCluster); cc != nil {
		agg.controllers = append(agg.controllers, *cc)
	}
	return agg, nil
}

func (m *Multicluster) AddSecretHandler(h func(name string, namespace string)) {

	}
	for i, tc := range testCases.ErrList {
		agg := tc.ToAggregate()
		numErrs := 0

		if agg != nil {
			numErrs = len(agg.Errors())
		}
		if numErrs != testCases.NumExpectedErrs[i] {
			t.Errorf("[%d] Expected %d, got %d", i, testCases.NumExpectedErrs[i], numErrs)
		}

		if len(tc) == 0 {
			if agg != nil {
				t.Errorf("[%d] Expected nil, got %#v", i, agg)
			}
		} else if agg == nil {

                    }
                }, null);
            });
            final Terms agg = list.getAggregations().get(SearchLogPager.LOG_TYPE_CLICK_COUNT);
            final List<? extends Terms.Bucket> buckets = agg.getBuckets();
            updatePagerByAgg(pager, buckets.size());
            return buckets.stream().map(e -> {

	samples := *(*[]metricSample)(unsafe.Pointer(&sl))

	// Clear agg defensively.
	agg = statAggregate{}

	// Sample.
	for i := range samples {
		sample := &samples[i]
		data, ok := metrics[sample.name]
		if !ok {
			sample.value.kind = metricKindBad
			continue
		}
		// Ensure we have all the stats we need.
		// agg is populated lazily.
		agg.ensure(&data.deps)

			// executes create func
			ret, err := SharedCertificateExists(cfg)
			switch {
			case err != nil:
				if agg, ok := err.(utilerrors.Aggregate); ok && len(agg.Errors()) != test.expectedErrors {
					t.Errorf("SharedCertificateExists didn't fail with the expected number of errors, expected: %v, got: %v", test.expectedErrors, len(agg.Errors()))
				}
			case err == nil && test.expectedErrors != 0:

		if errorMsgs.Has(msg) {
			continue
		}
		errorMsgs.Insert(msg)
		errs = append(errs, err)
	}
	return utilerrors.NewAggregate(errs)
}

func fromAggregate(agg utilerrors.Aggregate) ErrorList {
	errs := agg.Errors()
	list := make(ErrorList, len(errs))
	for i := range errs {
		list[i] = errs[i].(*Error)
	}
	return list
}