@Test
    public void test_calibrateCpuLoad_zeroTimeout() {
        final boolean result = systemHelper.calibrateCpuLoad(0L);
        assertTrue(result);
    }

    @Test
    public void test_getSystemCpuPercent() {
        final short cpuPercent = systemHelper.getSystemCpuPercent();
        // CPU percent can be -1 if not available or other negative values in test environment
        assertTrue(cpuPercent >= -1);