then:
        !mapping.getVersionUsedBy(version("0.9.9")).present
        !mapping.getVersionUsedBy(version("1.0-rc-1")).present
        !mapping.getVersionUsedBy(version("1.0-milestone-2")).present
        mapping.getVersionUsedBy(version("1.0-rc-2")).get() == CacheVersion.of(1)
        mapping.getVersionUsedBy(version("1.0-rc-3")).get() == CacheVersion.of(1)
        mapping.getVersionUsedBy(version("1.0")).get() == CacheVersion.of(1)

        then:
        cacheLayout.versionMapping.getVersionUsedBy(GradleVersion.version("7.6.1")).get() == CacheVersion.parse("2.99")
        cacheLayout.versionMapping.getVersionUsedBy(GradleVersion.version("7.6.2")).get() == CacheVersion.parse("2.101")
        cacheLayout.versionMapping.getVersionUsedBy(GradleVersion.version("7.7")).get() == CacheVersion.parse("2.101")

    private void determineUsedVersions() {
        usedVersions = new TreeSet<>();
        for (GradleVersion gradleVersion : getUsedGradleVersionsSmallerThanCurrent()) {
            usedVersions.addAll(cacheVersionMapping.getVersionUsedBy(gradleVersion).asSet());
        }
    }

    private SortedSet<GradleVersion> getUsedGradleVersionsSmallerThanCurrent() {
        return usedGradleVersions.getUsedGradleVersions().headSet(GradleVersion.current());

        this.versions = new TreeMap<>(versions);
    }

    public CacheVersion getLatestVersion() {
        return versions.get(versions.lastKey());
    }

    public Optional<CacheVersion> getVersionUsedBy(GradleVersion gradleVersion) {
        GradleVersion versionToFind = gradleVersion.isSnapshot() ? gradleVersion.getBaseVersion() : gradleVersion;

    }

    @Override
    CacheVersion getArtifactCacheLayoutVersion() {
        if (isSameOrNewer("1.9-rc-2")) {
            return CacheLayout.META_DATA.getVersionMapping().getVersionUsedBy(this.version).get();
        } else if (isSameOrNewer("1.9-rc-1")) {
            return CacheVersion.parse("1.31");
        } else if (isSameOrNewer("1.7-rc-1")) {
            return CacheVersion.parse("0.26");