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\n\n# @assay-ai/vitest\n\n*Custom Vitest matchers for LLM evaluation with Assay*\n\n[![npm version](https://img.shields.io/npm/v/@assay-ai/vitest?style=flat-square&color=6366f1)](https://www.npmjs.com/package/@assay-ai/vitest)\n[![downloads](https://img.shields.io/npm/dm/@assay-ai/vitest?style=flat-square&color=10b981)](https://www.npmjs.com/package/@assay-ai/vitest)\n[![License](https://img.shields.io/badge/license-MIT-blue?style=flat-square)](https://github.com/assay-ai/assay/blob/main/LICENSE)\n\n[Documentation](https://assay.js.org) · [Metrics](https://assay.js.org/metrics/) · [API Reference](https://assay.js.org/api/)\n\n
\n\n## Installation\n\n```bash\npnpm add -D @assay-ai/core @assay-ai/vitest # pnpm\nnpm install -D @assay-ai/core @assay-ai/vitest # npm\nyarn add -D @assay-ai/core @assay-ai/vitest # Yarn\n```\n\n## Quick Start\n\n```typescript\nimport { beforeAll, describe, expect, test } from \"vitest\";\nimport { setupAssayMatchers } from \"@assay-ai/vitest\";\n\nbeforeAll(() => {\n setupAssayMatchers();\n});\n\ndescribe(\"Customer Support Chatbot\", () => {\n test(\"answers are relevant\", async () => {\n await expect({\n input: \"What is your return policy?\",\n actualOutput: \"You can return items within 30 days of purchase.\",\n retrievalContext: [\n \"Our return policy allows returns within 30 days of purchase.\",\n ],\n }).toBeRelevant({ threshold: 0.8 });\n });\n\n test(\"does not hallucinate\", async () => {\n await expect({\n input: \"What is your return policy?\",\n actualOutput: \"You can return items within 30 days of purchase.\",\n context: [\n \"Our return policy allows returns within 30 days of purchase.\",\n ],\n }).toNotHallucinate();\n });\n});\n```\n\n## Part of the [Assay](https://github.com/assay-ai/assay) monorepo\n\n

\n \"Documentation\"\n \"npm\"\n \"GitHub\"\n \"Issues\"\n

\n","readmeFilename":"README.md"}