@Test
public void toHexStringWithByte() throws Exception {

    String s0 = null;
    s0 = HexUtil.toHexString((byte)0x65);
    Assert.assertEquals("65", s0);
    s0 = HexUtil.toHexString((byte)0x34);
    Assert.assertEquals("34", s0);
    s0 = HexUtil.toHexString((byte)0x00);
    Assert.assertEquals("00", s0);
    s0 = HexUtil.toHexString((byte)-1);
    Assert.assertEquals("FF", s0);
}