More tests for invalid cases

[pipermerriam]

What was wrong?

I believe this library could benefit from more test cases that verify decoding detects invalid serializations.

Here are some cases that come to mind

• offsets that point beyond the end of the data
• offsets that are less than a previous offset
• extra bytes on the end of a list of fixed-sized elements
• extra bytes between the fixed size elements and the variable sized elements in a vector or container
• not enough bytes or too many bytes in list/vector/container of fixed size elements

How can it be fixed?

Write these test cases.

[pipermerriam]

Running coverage would also be a good way to see which exception cases are not being excercised.

[jannikluhn]

Yep, I agree that we should have these kinds of tests. But I think they should be part of the YAML test suite so that we don't multiply the effort of writing these tests across all implementations.