Add tests for is_hex_byte and is_hex_byte_sequence
Add tests for is_hex_byte and is_hex_byte_sequence

drkitty/cyder,zeeman/cyder,OSU-Net/cyder,akeym/cyder,drkitty/cyder,zeeman/cyder,murrown/cyder,murrown/cyder,OSU-Net/cyder,zeeman/cyder,OSU-Net/cyder,murrown/cyder,OSU-Net/cyder,drkitty/cyder,murrown/cyder,zeeman/cyder,akeym/cyder,drkitty/cyder,akeym/cyder,akeym/cyder