The document discusses best practices for testing database code including: - Running integration tests inside database transactions to make them repeatable and isolated - Preparing all necessary data for each test in the setup rather than relying on order or shared state - Having a separate database instance for each developer and the build server to allow tests to modify data - Generating SQL scripts to reduce test replication and make database operations self-contained - Using tools like DbFit that integrate with testing frameworks and allow directly manipulating and verifying database contents in tests