name      | internalOs
        "windows" | OperatingSystem.WINDOWS
        "osx"     | OperatingSystem.MAC_OS
        "linux"   | OperatingSystem.LINUX
        "sunos"   | OperatingSystem.SOLARIS
        "solaris" | OperatingSystem.SOLARIS
        "freebsd" | OperatingSystem.FREE_BSD
    }

    def "can create arbitrary operating system"() {
        def os = new DefaultOperatingSystem("arbitrary")

        expect:

        } else if (org.gradle.internal.os.OperatingSystem.MAC_OS == operatingSystem) {
            return OperatingSystem.MAC_OS;
        } else  if (org.gradle.internal.os.OperatingSystem.SOLARIS == operatingSystem) {
            return OperatingSystem.SOLARIS;
        } else if (org.gradle.internal.os.OperatingSystem.FREE_BSD == operatingSystem) {
            return OperatingSystem.FREE_BSD;
        } else {

        when:
        System.properties['os.name'] = 'SunOS'

        then:
        OperatingSystem.current() instanceof OperatingSystem.Solaris

        when:
        System.properties['os.name'] = 'solaris'

        then:
        OperatingSystem.current() instanceof OperatingSystem.Solaris
    }

    def "uses os.name property to determine if linux"() {
        System.properties['os.name'] = 'Linux'

    }

    @Override
    public boolean isMacOsX() {
        return internalOs.isMacOsX();
    }

    @Override
    public boolean isSolaris() {
        return internalOs == OperatingSystem.SOLARIS;
    }

    @Override
    public boolean isFreeBSD() {
        return internalOs == OperatingSystem.FREE_BSD;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {

        where:
        type                           | config
        "unavailable architecture"     | "architecture 'sparc'"
        "unavailable operating system" | "operatingSystem 'solaris'"
        "unknown architecture"         | "architecture 'unknown'"
        "unknown operating system"     | "operatingSystem 'unknown'"
    }

Class <org.gradle.internal.os.OperatingSystem$MacOs> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (OperatingSystem.java:0)
Class <org.gradle.internal.os.OperatingSystem$Solaris> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (OperatingSystem.java:0)