TDD and BDD for emacs-lisp

[Xavier Maillard]

Hello,

for my next project (an IM tool), I would like to try to embrace TDD/BDD
methodology. I have never done this before and I even do not know the way I
will have to change my coding habits.

I have looked here and there to see if it is something emacs-lisp hackers
do, it seems that it has not spread much.

So, what tool(s) do you use if you do your devs using TDD/BDD ? Do you have
simple examples to share ? Is it recommended to do both ? Where does one
shine more than another ? etc. (I will probably have to read tons of
documentation but that's fine).

With ERT shipped with GNU emacs >= 24, there is no reason not to use it but
for BDD, I can see at least 2 (good) tools: ecukes and buttercup. Is there
any comparison chart somewhere ? 

Any help would be appreciated to start using TDD/BDD.

Thank you
Xavier