@Test
  public void testClone() throws URISyntaxException {
    UriComponentsBuilder builder1 = UriComponentsBuilder.newInstance();
    builder1
        .scheme("http")
        .host("e1.com")
        .path("/p1")
        .pathSegment("ps1")
        .queryParam("q1")
        .fragment("f1");

    UriComponentsBuilder builder2 = (UriComponentsBuilder) builder1.clone();
    builder2
        .scheme("https")
        .host("e2.com")
        .path("p2")
        .pathSegment("ps2")
        .queryParam("q2")
        .fragment("f2");

    UriComponents result1 = builder1.build();
    assertEquals("http", result1.getScheme());
    assertEquals("e1.com", result1.getHost());
    assertEquals("/p1/ps1", result1.getPath());
    assertEquals("q1", result1.getQuery());
    assertEquals("f1", result1.getFragment());

    UriComponents result2 = builder2.build();
    assertEquals("https", result2.getScheme());
    assertEquals("e2.com", result2.getHost());
    assertEquals("/p1/ps1/p2/ps2", result2.getPath());
    assertEquals("q1&q2", result2.getQuery());
    assertEquals("f2", result2.getFragment());
  }