@Test
public void testToHexString() {

    assertThat(Numeric.toHexString(new byte[]{}), is("0x"));
    assertThat(Numeric.toHexString(new byte[]{0x1}), is("0x01"));
    assertThat(Numeric.toHexString(HEX_RANGE_ARRAY), is(HEX_RANGE_STRING));
}