JavaVersion.toVersion("1.5.0.4_b109") == JavaVersion.VERSION_1_5

        JavaVersion.toVersion("5") == JavaVersion.VERSION_1_5
        JavaVersion.toVersion("6") == JavaVersion.VERSION_1_6
        JavaVersion.toVersion("7") == JavaVersion.VERSION_1_7
        JavaVersion.toVersion("8") == JavaVersion.VERSION_1_8
        JavaVersion.toVersion("9") == JavaVersion.VERSION_1_9
        JavaVersion.toVersion("10") == JavaVersion.VERSION_1_10

        }

        // 3.x - 4.6 works on Java 7 - 8
        if (isSameOrOlder("4.6")) {
            return javaVersion >= JavaVersion.VERSION_1_7 && javaVersion <= JavaVersion.VERSION_1_8
        }

        if (isSameOrOlder("4.11")) {
            return javaVersion >= JavaVersion.VERSION_1_7 && javaVersion <= JavaVersion.VERSION_1_10
        }

        }
    }

    static final class Jdk10OrEarlier implements TestPrecondition {
        @Override
        boolean isSatisfied() {
            return JavaVersion.current() <= JavaVersion.VERSION_1_10
        }
    }

    static final class Jdk11OrLater implements TestPrecondition {
        @Override
        boolean isSatisfied() {

        JavaVersion.forClass(scalaClassFile("JavaThing.class").bytes) == javaVersion
        JavaVersion.forClass(scalaClassFile("ScalaHall.class").bytes) == JavaVersion.VERSION_1_8
        JavaVersion.forClass(classFile("scala", "test", "ScalaTest.class").bytes) == JavaVersion.VERSION_1_8

        where:

        when:
        withInstallations(jdk).run(":test", "--info")

        then:
        executedAndNotSkipped(":test")
        outputContains("Running Groovy test with Java version ${jdk.javaVersion}")

        JavaVersion.forClass(groovyClassFile("JavaThing.class").bytes) == javaVersion

            .collect(Collectors.toList());
    }

    public static Map<Jvm, JavaVersion> getAvailableJdksWithVersion() {
        Map<Jvm, JavaVersion> result = new HashMap<>();
        for (JavaVersion javaVersion : JavaVersion.values()) {
            for (Jvm javaInfo : getAvailableJdks(javaVersion)) {
                result.put(javaInfo, javaVersion);
            }
        }
        return result;
    }

        File javaHome,
        String javaVersion,
        String javaVendor,
        String runtimeName,
        String runtimeVersion,
        String jvmName,
        String jvmVersion,
        String jvmVendor,
        String architecture
    ) {
        return new DefaultJvmInstallationMetadata(javaHome, javaVersion, javaVendor, runtimeName, runtimeVersion, jvmName, jvmVersion, jvmVendor, architecture);

        'compatible platforms, but additional attributes unmatched' | [platform: JavaVersion.JAVA8]                 | [platform: JavaVersion.JAVA6, flavor: 'free'] | [platform: JavaVersion.JAVA6, flavor: 'paid'] | null

        'openJdk4'       | openJdkJvm('4')          | JavaVersion.VERSION_1_4 | 'OpenJDK 4'                  | false
        'openJdk5'       | openJdkJvm('5')          | JavaVersion.VERSION_1_5 | 'OpenJDK 5'                  | false
        'openJdk6'       | openJdkJvm('6')          | JavaVersion.VERSION_1_6 | 'OpenJDK 6'                  | false

    }

    private JavaVersion toJavaVersion(ideaLanguageLevel) {
        JavaVersion.valueOf(ideaLanguageLevel.level.replaceFirst("JDK", "VERSION"));
    }

    private JavaVersion getDefaultIdeaPluginLanguageLevelForNonJavaProjects() {
        JavaVersion.VERSION_1_6 // see IdeaPlugin#configureIdeaProject(Project)
    }

    private JavaVersion getDefaultIdeaPluginLanguageLevelForJavaProjects() {