@Test
public void success_GeneratePrivateKey_from_all_zero_byte_array() {

    PrivateKey privateKey = PrivateKeyEd25519.fromBytes(new byte[32]);
    assertThat(privateKey.getInteger(), is(new BigInteger(1, new byte[32])));
    assertThat(privateKey.getInteger(), is(new BigInteger("00")));
    assertThat(privateKey.getRaw(), is(ByteUtils.paddingZeroOnHead(new BigInteger("00").toByteArray(), 32)));
}