}

  public void testBase64CannotIgnoreCase() {
    assertThrows(IllegalStateException.class, () -> base64().ignoreCase());
  }

  public void testBase64AlternatePadding() {
    BaseEncoding enc = base64().withPadChar('~');
    testEncodingWithSeparators(enc, "", "");
    testEncodingWithSeparators(enc, "f", "Zg~~");
    testEncodingWithSeparators(enc, "fo", "Zm8~");