},
			services:  []*Service{serviceA8000},
			expected:  []*Service{serviceA8000},
			namespace: "a",
		},
		{
			name: "fall back to wildcard namespace",
			listenerHosts: map[string]hostClassification{
				wildcardNamespace: {allHosts: []host.Name{"host"}, exactHosts: sets.New[host.Name]("host")},
				"a":               {allHosts: []host.Name{"alt"}, exactHosts: sets.New[host.Name]("alt")},

		}

		hc := hostsByNamespace[ns]
		hc.allHosts = append(hc.allHosts, svc.Hostname)
		hostsByNamespace[ns] = hc

		if !svc.Hostname.IsWildCarded() {
			hostsByNamespace[ns].exactHosts.Insert(svc.Hostname)
		}
	}

	virtualServiceSpec1 := &networking.VirtualService{
		Hosts:    []string{"test-private-2.com"},

			[]config.Config{virtualServiceWithGoogleWildcardHost}, 80, wildcardIndex,
		)
		// The service hosts (*.example.org and goodbye.hello.example.org) and the unattached VS host (*.google.com)
		g.Expect(vhosts).To(HaveLen(3))
		for _, vhost := range vhosts {
			if len(vhost.VirtualServiceHosts) > 0 && vhost.VirtualServiceHosts[0] == "*.google.com" {

					},
					Bind:  "unix://foo/bar/headless",
					Hosts: []string{"*/test-headless.com"},
				},
				{
					Port: &networking.SidecarPort{
						Number:   18888,
						Protocol: "HTTP",
						Name:     "foo",
					},
					Hosts: []string{"*/test-headless.com"},
				},
				{
					// Wildcard egress importing from all namespaces
					Hosts: []string{"*/*"},
				},
			},

	wchosts := make([]host.Name, 0)

	// As a performance optimization, process non wildcard hosts first, so that they can be
	// looked up directly in the service registry map.
	for _, hostname := range rule.Hosts {
		vshost := host.Name(hostname)
		if vshost.IsWildCarded() {
			// We'll process wild card hosts later
			wchosts = append(wchosts, vshost)
			continue
		}

	})
	cases := []struct {
		proxyNs     string
		serviceNs   string
		host        string
		wantSubsets []string
	}{
		{
			proxyNs:     "test1",
			serviceNs:   "test1",
			host:        testhost,
			wantSubsets: []string{"subset1", "subset2"},
		},
		{
			proxyNs:     "test1",
			serviceNs:   "test2",
			host:        testhost,
			wantSubsets: []string{"subset1", "subset2"},
		},
		{

			},
			endpointsChangeTracker: NewEndpointsChangeTracker("host1", nil, v1.IPv4Protocol, nil, nil),
			namespacedName:         types.NamespacedName{Name: "svc1", Namespace: "ns1"},
			paramEndpointSlice:     generateEndpointSlice("svc1", "ns1", 1, 3, 999, 999, []string{"host1", "host2"}, []*int32{ptr.To[int32](80), ptr.To[int32](443)}),

type consolidatedDestRules struct {
	// Map of dest rule host to the list of namespaces to which this destination rule has been exported to
	exportTo map[host.Name]sets.Set[visibility.Instance]
	// Map of dest rule host and the merged destination rules for that host.
	// Only stores specific non-wildcard destination rules
	specificDestRules map[host.Name][]*ConsolidatedDestRule
	// Map of dest rule host and the merged destination rules for that host.

			},
		},
		"valid wildcard host": {
			tweakIngress: func(ing *networking.Ingress) {
				ing.Spec.Rules[0].Host = "*.bar.com"
			},
			expectErrsOnFields: []string{},
		},
		"invalid wildcard host (foo.*.bar.com)": {
			tweakIngress: func(ing *networking.Ingress) {
				ing.Spec.Rules[0].Host = "foo.*.bar.com"
			},
			expectErrsOnFields: []string{
				"spec.rules[0].host",
			},
		},

		return &c
	}()

	stringsToHosts := func(hosts []string) []host.Name {
		ret := make([]host.Name, len(hosts))
		for i, hostname := range hosts {
			ret[i] = host.Name(hostname)
		}
		return ret
	}

	cases := []struct {
		name    string
		current *config.Config
		new     *config.Config

		added     []host.Name
		deleted   []host.Name
		updated   []host.Name