func pickFirstVisibleNamespace(ps *PushContext, byNamespace map[string]*Service, configNamespace string) string {
	nss := make([]string, 0, len(byNamespace))
	for ns := range byNamespace {
		if ps.IsServiceVisible(byNamespace[ns], configNamespace) {
			nss = append(nss, ns)
		}
	}
	if len(nss) > 0 {
		sort.Strings(nss)
		return nss[0]
	}
	return ""

		s, exist := push.ServiceIndex.HostnameAndNamespace[hostname][virtualService.Namespace]
		if exist {
			// We should check whether the selected service is visible to the proxy node.
			if push.IsServiceVisible(s, node.ConfigNamespace) {
				service = s
			}
		}
		// If we find no service for the namespace of virtualService or the selected service is not visible to the proxy node,

	for _, service := range ps.ServiceIndex.HostnameAndNamespace[hostname] {
		return service
	}

	// No service found
	return nil
}

// IsServiceVisible returns true if the input service is visible to the given namespace.
func (ps *PushContext) IsServiceVisible(service *Service, namespace string) bool {
	if service == nil {
		return false
	}

	ns := service.Attributes.Namespace

						visibility.None,
					),
				},
			},
			expect: false,
		},
	}

	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			isVisible := c.pushContext.IsServiceVisible(c.service, targetNamespace)

			g := NewWithT(t)
			g.Expect(isVisible).To(Equal(c.expect))
		})
	}
}

func serviceNames(svcs []*Service) []string {
	var s []string