TESTS: df_mesh (c++/py)

[9and3]

The unit testing for df_meshes for both c++ and python pybind needs to be added to the suite.
See CONTRIBUTING.md for more info on how to to do tests.

[9and3]

@DamienGilliard rappel .:)

[DamienGilliard]

it's on my to-do list for today !

[9and3]

Hello @DamienGilliard , this is not tracked anywhere, are you on this one? thanks 🙌

[DamienGilliard]

@9and3 The python tests were done in pull request #59 but the c++ tests are not done yet (I mean there is no tests/unit_tests/DFMeshTest.cc). I'll try to do it tomorrow if I can find the time.