  @Test
  public void testParent() {

    assertEquals("dir1/dir2", Paths.getParentOf("dir1/dir2/file"));
    assertEquals("", Paths.getParentOf("file"));
    assertEquals("c:", Paths.getParentOf("c:/file"));
    assertEquals("/", Paths.getParentOf("/file"));
    assertEquals("/dir", Paths.getParentOf("/dir/file"));
  }