assertThat(ignoreCase).isSameInstanceAs(base32().ignoreCase());
    testDecodes(ignoreCase, "MZXW6YTBOI======", "foobar");
    testDecodes(ignoreCase, "mzxw6ytboi======", "foobar");
  }

  public void testBase32Offset() {
    testEncodesWithOffset(base32(), "foobar", 0, 6, "MZXW6YTBOI======");
    testEncodesWithOffset(base32(), "foobar", 1, 5, "N5XWEYLS");
    testEncodesWithOffset(base32(), "foobar", 2, 3, "N5RGC===");