The issue is this: A user can bypass the fixed tests manually, and then for the random tests, just return the input. You need to actually check the result of the encoding/decoding for random tests, not just encode then decode--because you're not actually forcing them to do it.
The issue is this: A user can bypass the fixed tests manually, and then for the random tests, just return the input. You need to actually check the result of the encoding/decoding for random tests, not just encode then decode--because you're not actually forcing them to do it.