Which service override pattern substitutes the database adapter in laminas integration tests without production credentials?

When developing a laminas-based application, integration tests may require database-backed services defined in laminas-db or controllers routed through the laminas-mvc layer. A common requirement is to run these tests without connecting to production databases or exposing live credentials.

The framework's ServiceManager allows service overrides in test contexts, and laminas-db can be configured with a pdo_sqlite adapter pointed at an in-memory database. However, sqlite's SQL dialect and type handling differ from MySQL or PostgreSQL, which raises the question of whether tests using sqlite will reliably validate production-bound queries.

Additionally, laminas components are independently versioned, meaning class names, service names and configuration keys can vary between releases, affecting the stability of test overrides. Which service override pattern best preserves the production ServiceManager composition while substituting the database adapter? Does running real sqlite queries in tests adequately cover vendor-specific SQL and transaction behavior, or is mocking the adapter layer necessary? How do version differences across laminas-db, laminas-mvc and laminas-test influence the reliability of credential-free integration tests?