Canonical unit tests

It would be great if the spec had a bunch of canonical test cases in some unambiguous format (something not prone to variations in antialiasing etc). This could be done for some aspects of the decoding, e.g. given an input custom palette, what does CREG contain at the start of execution, or given an IconVG file consisting only of styling opcodes, what are the values in the registers, viewBox, etc, at the end of execution.