approval-tests

What problem does it solve?

Approval testing provides a robust alternative to many small assertions by capturing a known-good output and comparing future runs against it, reducing flaky tests and maintenance overhead.

Core Features & Use Cases

• Cross-language verification: supports Python, Java, and JavaScript/TypeScript environments to verify complex outputs.
• Snapshot/Golden-master style testing: validates large outputs with a single approval, including combinations and logs.
• On-demand references and patterns: leverages optional scripts, references, and assets to organize testing patterns and reuse test data.

Quick Start

Install the language package for approvals (e.g., pip install approvaltests, npm install approvals), write a test that calls verify or verifyAsJson, run the tests to generate .received/.approved files, review the received output, and rename it to approved to finalize the baseline.