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

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

  public void testSimplifyWhiteSpace() {
    assertEquals(" ", simplifyPath(" "));
  }

  public void testSimplify2() {
    assertEquals("x", simplifyPath("x"));
  }

  public void testSimplify3() {