Add 3 new invalid test cases

[asanso]

The 3 test cases;

1. first offset starts wrongly into the fixed position
2. last variable part overflowing the max size
3. last variable part has a wrong number f bytes

[ralexstokes]

always great to see more test coverage!

i am wondering how the two last tests you wrote differ in terms of SSZ functionality they are touching, they both seem to just add extra data to the end which should yield a deserialization error but not necessarily because the offsets are incorrect (and that is what this part of test gen code suggests it is doing

[asanso]

always great to see more test coverage!

i am wondering how the two last tests you wrote differ in terms of SSZ functionality they are touching, they both seem to just add extra data to the end which should yield a deserialization error but not necessarily because the offsets are incorrect (and that is what this part of test gen code suggests it is doing

Yes you are correct the last 2 tests are not related to invalid offset but are still invalid tests nevertheless, IMHO the more invalid case we have, the better.

[ralexstokes]

nice updates!

still want to understand your thinking more on structure

[ralexstokes]

nice thanks :)