public void testSimplify12() {
    assertEquals("/x", simplifyPath("//a//../x//"));
  }

  public void testSimplify13() {
    assertEquals("../c", simplifyPath("a/b/../../../c"));
  }

  public void testSimplifyDotDot() {
    assertEquals("..", simplifyPath(".."));
  }

  public void testSimplifyDotDotSlash() {
    assertEquals("..", simplifyPath("../"));
    assertEquals("..", simplifyPath("a/../.."));