See [unittest][5] for start.
+## Database
+By default, sqlite3 `coffee.db` file is needed. You may create testing copy of
+database by:
+```
+python3 -c '
+from ut.test_db import create_test_db
+create_test_db("coffee.db")
+'
+```
+
+Database is needed to pass the tests.
+
## License
This project is developed under [GNU GPLv3 license][4].