- pytest (https://docs.pytest.org/en/6.2.x/)
- coverage (https://pypi.org/project/pytest-cov/)
- time freezing (https://pypi.org/project/immobilus/)
- snapshots (https://pypi.org/project/snapshottest/)
- factories (https://factoryboy.readthedocs.io/en/stable/, https://faker.readthedocs.io/en/master/)
- mocks (https://pypi.org/project/pytest-mock/, https://devdocs.io/python~3.9/library/unittest.mock)
- patch with return
- patch with exception