https://docs.pytest.org/en/latest/usage.html
pytest
pytest path/to/tests/
pytest path/to/tests/test_file.py
pytest path/to/tests/test_file.py::test_func
pytest path/to/tests/test_file.py::TestClass
pytest path/to/tests/test_file.py::TestClass::test_func
https://docs.pytest.org/en/latest/example/index.html
https://pytest-cov.readthedocs.io/en/latest/reporting.html
py.test --cov-report term-missing --cov=myproj tests/