This package gives you the capability to create as many fixtures to represent as many mock instances of e.g. SQLite, Postgres, Mongo, etc might actually exist in your system.
Furthermore, you can prepopulate the connections those fixtures yield to you with whatever DDL, preset data, or functions you might require.
Each fixture you create can be used in multiple tests without risking data leakage or side-effects from one test to another, see Internals for more details.
See Config for information on customizing the configuration for docker-based fixtures.