Command to run from the main folder:
#python 3.6
# All test
pytest tests/
# one test, ex
pytest tests/test_classorder.py
# stop after first failure
pytest -x
# run a specific test within a module:
pytest test_mod.py::test_func
# run slow tests
pytest tests/ -m slow
# run not slow tests
pytest tests/ -m 'not slow'
# get coverage
python pytest --cov=. tests/