I totally agree on this. Having read papers and tried to implement, or even re-implement the same algorithm, even when their source code is available, it's hard

I totally agree on this. Having read papers and tried to implement, or even re-implement the same algorithm, even when their source code is available, it's hard to get results that match. I'm not a hard core TDD guy, but sometimes a few tests go a long way to making your code reproducible...or even just working correctly.