help wanted
Description
I was looking for unit tests to understand corner cases + see how many of them are to port to C++. I haven't found any unit test of pommerman forward model logic.
It will be good to have at least regression tests when fixing bugs like: https://github.com/MultiAgentLearning/playground/commit/b16c395c347aa4f0ad0284e9e0e351c4bae413d2, https://github.com/MultiAgentLearning/playground/commit/3c06283f0906d72fd1a88850c4e00873baae4ba9, https://github.com/MultiAgentLearning/playground/commit/8b57431ebfe9e9894cc7766a780e3fc0a346e959.