actual, value, found := model.MostSpecificHostMatch(tt.needle, specific, wildcard)
			if tt.want != "" && !found {
				t.Fatalf("model.MostSpecificHostMatch(%q, %v) = %v, %v, %t; want: %v", tt.needle, tt.in, actual, value, found, tt.want)
			} else if actual != tt.want {
				t.Fatalf("model.MostSpecificHostMatch(%q, %v) = %v, %v, %t; want: %v", tt.needle, tt.in, actual, value, found, tt.want)
			}

			out = meta.Namespace + "/" + gwname[i+1:]
		}
	}
	return out
}

// MostSpecificHostMatch compares the maps of specific and wildcard hosts to the needle, and returns the longest element
// matching the needle and it's value, or false if no element in the maps matches the needle.
func MostSpecificHostMatch[V any](needle host.Name, specific map[host.Name]V, wildcard map[host.Name]V) (host.Name, V, bool) {

				if !exists {
					fqdnVirtualServiceHostIndex[host.Name(h)] = vs
				}
			}
		}
	}

	mostSpecificWildcardVsIndex := make(map[host.Name]types.NamespacedName)
	comparator := MostSpecificHostMatch[config.Config]
	if features.PersistOldestWinsHeuristicForVirtualServiceHostMatching {
		comparator = OldestMatchingHost
	}
	for _, svc := range services {