Python unittest discovery with subfolders

My unittest folder is organized this way. ``` . |-- import | |-- import.kc | |-- import.kh | `-- import_test.py |-- module | |-- module.kc | |-- module.kh | `-- module_test.py `-- test.py ``` I'd want to simply run `test.py` to run each of my `*_test.py` using the unittest Python module. Currently, my test.py contains ``` #!/usr/bin/env python import unittest if __name__ == "__main__": suite = unittest.TestLoader().discover('.', pattern = "*_test.py") unittest.TextTestRunner(verbosity=2).run(suite) ``` The python documentation says that it should automatically discover my test in the subfolders. But it does not. At the moment, it only outputs ``` ---------------------------------------------------------------------- Ran 0 tests in 0.000s OK ``` I'm sure it is not a problem with my `*_test.py` file, because when I move them into the root directory, it works fine.. What am I doing wrong?