testEncodingWithCasing(base16(), "foobar", "666F6F626172");
  }

  public void testBase16UpperCaseIsNoOp() {
    assertThat(base16().upperCase()).isSameInstanceAs(base16());
  }

  public void testBase16LowerCase() {
    BaseEncoding lowerCase = base16().lowerCase();
    assertThat(lowerCase).isNotSameInstanceAs(base16());
    assertThat(lowerCase).isSameInstanceAs(base16().lowerCase());