);
    }

    private OsMemoryStatusSnapshot(OsMemoryStatusAspect.Available physicalMemory, OsMemoryStatusAspect virtualMemory) {
        this.physicalMemory = physicalMemory;
        this.virtualMemory = virtualMemory;
    }

    @Override
    public OsMemoryStatusAspect.Available getPhysicalMemory() {
        return physicalMemory;
    }

    @Override
    public OsMemoryStatusAspect getVirtualMemory() {

        expect:
        snapshot.physicalMemory.total == mbsToBytes(1024)
        snapshot.physicalMemory.free == mbsToBytes(224)
    }

    def "negative free memory returns zero"() {
        def snapshot = new CGroupMemoryInfo().getOsSnapshotFromCgroup(mbsToBytesAsString(1024), mbsToBytesAsString(512))

        expect:
        snapshot.physicalMemory.total == mbsToBytes(512)
        snapshot.physicalMemory.free == 0

    def "minimum threshold is enforced"() {
        given:
        def expirationStrategy = new LowMemoryDaemonExpirationStrategy(0)

        when:
        1 * mockMemoryStatus.physicalMemory >> { new DefaultAvailableOsMemoryStatusAspect("physical", MAX_MEMORY, ONE_GIG) }
        expirationStrategy.onOsMemoryStatus(mockMemoryStatus)

        then:

        given:
        def snapshot = new MemInfoOsMemoryInfo().getOsSnapshotFromMemInfo(meminfoLinux3())

        expect:
        snapshot.physicalMemory.free == 32_343_658_496L
        snapshot.physicalMemory.total == 50_650_296_320L
        snapshot.virtualMemory instanceof OsMemoryStatusAspect.Unavailable
    }

    def "parses memory from /proc/meminfo on Linux 4.x"() {
        given: