in Sources/PackageRegistryCompatibilityTestSuite/TestConfigurationGenerator.swift [167:182]
func linkRelations(version: Version, versions: [Version]) -> Set<String> {
var relations: Set<String> = ["latest-version"]
guard let index = versions.firstIndex(of: version) else {
return relations
}
if index > 0 {
relations.insert("predecessor-version")
}
if index < versions.count - 1 {
relations.insert("successor-version")
}
return relations
}