@Test(expected = IllegalArgumentException.class)
public void testWIFFirstByteDifferentThan0x80() {

    byte[] wifBytes = Base58.decode("L25kgAQJXNHnhc7Sx9bomxxwVSMsZdkaNQ3m2VfHrnLzKWMLP13A");
    wifBytes[0] = (byte) 0x81;
    String wifString = Base58.encode(wifBytes);
    WIF.getPrivateKeyFromWIF(wifString);
}