Add pytest-mrt under Testing > Database Migration Testing

[croc100]

What is pytest-mrt?

pytest-mrt is a pytest plugin and CLI tool that verifies Alembic and Django database migrations are safely reversible.

It catches rollback failures before they reach production:

• Detects missing or no-op downgrade() implementations
• Verifies schema is fully restored after rollback
• Seeds real rows and confirms data survives the round-trip
• Static analysis for patterns like RemoveField, DROP TABLE, RunSQL without reverse

Why a new "Database Migration Testing" subsection?

There is no existing category for database migration testing tools. Migration rollback safety is a real, common pain point — many teams have been burned by downgrade() functions that look correct but silently fail. This is a distinct niche from general testing frameworks or database drivers.

Requirements met

• Actively maintained (v1.0.0, June 2026)
• Available on PyPI: pip install pytest-mrt
• Open source (MIT)
• Documented: https://croc100.github.io/pytest-mrt