[How to run evals with Vitest/Jest (beta) | 🦜️🛠️ LangSmith](https://docs.smith.langchain.com/evaluation/how_to_guides/vitest_jest): LLM should read this page when implementing testing for LLM applications in JavaScript/TypeScript or when setting up automated evaluation of language models with Vitest/Jest. This page provides a comprehensive guide to running evaluations with Vitest/Jest in LangSmith, including setup instructions for both frameworks, defining test suites, logging outputs, tracing feedback, parameterizing tests across multiple examples, and configuring test behavior with options for skipping, focusing, and dry-run mode.

