### Question:
ExpandableUrl { public static boolean isOsWindows(){ return System.getProperty("os.name").toLowerCase().startsWith("win"); } private  ExpandableUrl(String s); static ExpandableUrl createFromPath(String path); static ExpandableUrl createFromStringUrl(String url); static String unifySlashes(String dir); static boolean isOsWindows(); URL getExpandedURL(); String getRawURL(); String getExpandedPath(); String getRawPath(); File getFile(); @Override String toString();  }### Answer:
@Test @EnabledOnOs(OS.WINDOWS) void testIsOsWindowsOnWindows() { assertTrue(isOsWindows()); }
@Test @EnabledOnOs(OS.LINUX) void testIsOsWindowsOnLinux() { assertFalse(isOsWindows()); }