static boolean isMac0(String osName) {
        osName = osName.toLowerCase();
        return (osName.contains("mac") || osName.contains("darwin"));
    }
@Test
    public void test_isMac() {
        assertFalse(OS.isMac0("Windows"));
        assertFalse(OS.isMac0("wInDoWs"));
        assertFalse(OS.isMac0("Windows 10"));
        assertFalse(OS.isMac0("Windows 11"));
        assertFalse(OS.isMac0("LINUX"));
        assertFalse(OS.isMac0("LiNuX"));
        assertFalse(OS.isMac0("linux"));
        assertTrue(OS.isMac0("Mac OS X"));
    }