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gh-105539: Explict resource management for connection objects in sqlite3 tests (#108017)

- Use memory_database() helper
- Move test utility functions to util.py
- Add convenience memory database mixin
- Add check() helper for closed connection tests
E
Erlend E. Aasland committed
1344cfac43a1920c596b0e8718ca0567889e697b
Parent: c9d83f9
Committed by GitHub <noreply@github.com> on 8/17/2023, 6:45:48 AM