Unit tests key file / password / hardware key

Create unit tests to manage the new library that will be created with the source code of the database formatting module.

Start by locating the database formatting library and its key-file, password, and hardware-key entry points; the issue names no file or test path. Define unit-test coverage for managing those inputs and verify the formatting module's behavior. Done means the requested cases are covered by repeatable tests.

Written by the indexing model from the issue text.