}

  public void testBase64Offset() {
    testEncodesWithOffset(base64(), "foobar", 0, 6, "Zm9vYmFy");
    testEncodesWithOffset(base64(), "foobar", 1, 5, "b29iYXI=");
    testEncodesWithOffset(base64(), "foobar", 2, 3, "b2Jh");
    testEncodesWithOffset(base64(), "foobar", 3, 1, "Yg==");
    testEncodesWithOffset(base64(), "foobar", 4, 0, "");
  }

  public void testBase64Url() {

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