pgsql-parser-testing-fixtures

Automate PostgreSQL parser regression testing by generating executable Jest test suites directly from raw SQL fixtures, validating that parsed ASTs deparse back to identical SQL and re-parse to match the original AST.

Round-trip SQL parsing fidelity validation verifies that a parsed AST can be deparsed back to identical SQL and re-parsed to match the original AST, catching parsing regressions when contributing to PostgreSQL parser development.

Add a new SQL test case to the kitchen-sink fixtures, regenerate the full test suite automatically, and run all deparser tests to confirm no regressions are introduced without manual test writing.

Yes, the PostgreSQL testing pipeline supports the deparser, PL/pgSQL deparser, and AST transform packages, applying standardized fixture-based testing across the pgsql-parser monorepo.

PostgreSQL AST manipulation changes break existing parsing behavior when code generation regressions occur, which automated round-trip fidelity validation catches by verifying deparsed SQL matches the original parse.

Maintain consistent test suites for PostgreSQL parsing tools by using a standardized fixture-based testing pipeline that automatically generates executable Jest tests from raw SQL fixtures, eliminating manual test maintenance overhead.