### Question:
ZkPath { public static boolean isHidden(String path) { return getFilename(path).startsWith("."); }  static String append(String... parts); static String getFilename(String path); static boolean isHidden(String path); static List<String> filterOutHiddenPaths(List<String> paths);  }### Answer:
@Test public void testIsHidden() { assertEquals(false, ZkPath.isHidden("/a/b/c")); assertEquals(true, ZkPath.isHidden("/a/b/.c")); assertEquals(true, ZkPath.isHidden("/a/b/..c")); }