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Spawn Tool Enables Golden-File Regression Testing for PostgreSQL Databases

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A developer known as Winsaucerer has detailed how the open-source SQL build tool Spawn can be used to run regression tests on PostgreSQL databases. Spawn requires no database extensions and works through a standard psql connection, making it easy to integrate into existing projects. The testing workflow involves creating test files, running them via psql, capturing stdout and stderr output, and comparing results against stored golden files. The tutorial walks through setting up a Docker-based PostgreSQL instance and building a sample orders database to demonstrate the testing features. Spawn's golden-file approach allows developers to detect unintended changes in database behaviour across migrations and updates.

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