Jvm getJvm() {
        new Jvm(os)
    }

    def setup() {
        JavaVersion.resetCurrent()
        OperatingSystem.resetCurrent()
    }

    def cleanup() {
        JavaVersion.resetCurrent()
        OperatingSystem.resetCurrent()
    }

    def assertJreHomeIfNotJava9(Jvm jvm, TestFile softwareRoot, String jreHome) {

    private static final String TOO_BIG_STR = TOO_BIG.toString()

    @Rule
    SetSystemProperties sysProp = new SetSystemProperties()

    def setup() {
        JavaVersion.resetCurrent()
    }

    def cleanup() {
        JavaVersion.resetCurrent()
    }

    def toStringReturnsVersion() {
        expect:
        JavaVersion.VERSION_1_3.toString() == "1.3"
        JavaVersion.VERSION_1_4.toString() == "1.4"

    @Rule TestNameTestDirectoryProvider tmpDir = new TestNameTestDirectoryProvider(getClass())

    def setup() {
        OperatingSystem.resetCurrent()
    }

    def cleanup() {
        OperatingSystem.resetCurrent()
    }

    def cleanupSpec() {
        resetOperatingSystemClassStaticFields()
    }

    def "uses os.name property to determine OS name"() {
        given:

        if (currentJavaVersion == null) {
            currentJavaVersion = toVersion(System.getProperty("java.version"));
        }
        return currentJavaVersion;
    }

    static void resetCurrent() {
        currentJavaVersion = null;
    }

    public static JavaVersion forClassVersion(int classVersion) {
        return getVersionForMajor(classVersion - CLASS_MAJOR_VERSION_OFFSET);
    }

        if (currentOs == null) {
            currentOs = forName(System.getProperty("os.name"));
        }
        return currentOs;
    }

    // for testing current()
    static void resetCurrent() {
        currentOs = null;
    }

    public static OperatingSystem forName(String os) {
        String osName = os.toLowerCase(Locale.ROOT);
        if (osName.contains("windows")) {
            return WINDOWS;