.groupBy { "${it.major}.${it.minor}" }
            .map { (_, v) -> v.maxOrNull()!!.format() }

        // Limit to first and last release of each major version
        mainTestedVersions = testedVersions.map { VersionNumber.parse(it.gradleVersion().version) }
            .groupBy { it.major }

            val functionalTestsWithSplit: Map<String, List<BaseGradleBuildType>> =
                functionalTests.filter { largeSubProjectRegex.containsMatchIn(it.name) }.groupBy { it.getSubProjectSplitName().substringBefore('_') }
            functionalTestsWithSplit.forEach {
                assertAllSplitsArePresent(it.key, it.value)
                assertCorrectParameters(it.key, it.value)

    fun DocumentBuilderFactory.fetchFirstAndLatestsOfEachMinor(minimumSupported: String, mavenMetadataUrl: String): List<String> {
        val versionsByMinor = fetchVersionsFromMavenMetadata(mavenMetadataUrl)
            .groupBy { it.take(3) }
            .toSortedMap()
        val latests = buildList {
            versionsByMinor.entries.forEachIndexed { idx, entry ->
                add(entry.value.lastOrNull { !it.contains("-") })

    private
    fun DocumentBuilderFactory.fetchLatests(minimumSupported: String, mavenMetadataUrl: String): List<String> {
        var latests = fetchVersionsFromMavenMetadata(mavenMetadataUrl)
            .groupBy { it.take(3) }
            .map { (_, versions) -> versions.first() }
        latests = (latests + minimumSupported).sorted()
        latests = latests.subList(latests.indexOf(minimumSupported) + 1, latests.size)

                        os to (testProject to performanceTestDuration)
                    }
            }
        }
        return pairs.groupBy({ it.first }, { it.second })
            .mapValues { entry -> entry.value.groupBy({ it.first }, { it.second }) }
    }

    private
    fun readPerformanceTestConfigurations(performanceTestsCiJson: File): List<PerformanceTestConfiguration> {

            )
        }

        sourceFiles
    }


private
fun Sequence<KotlinExtensionFunction>.groupedByTarget(): Map<ApiType, List<KotlinExtensionFunction>> =
    groupBy { it.targetType }


private
fun writeExtensionsTo(outputFile: File, packageName: String, targetType: ApiType, extensions: List<KotlinExtensionFunction>): Unit =
    outputFile.bufferedWriter().use { writer ->