# gdtest_seealso > A synthetic test package testing %seealso ## Docs ### API Reference #### Classes > Main classes provided by the package - [Encoder](reference/Encoder.html): An encoder/decoder pair #### Functions > Utility functions - [decode](reference/decode.html): Decode bytes to a string - [encode](reference/encode.html): Encode a string to bytes - [validate](reference/validate.html): Validate that data can be encoded/decoded