AGENTS.md

@@ -26,8 +26,10 @@ It is written in TypeScript and compiled to a JavaScript module suitable for use
   - `dist/`: specific build artifacts. Do not edit files here directly.
 
 ## Testing
-- Currently, no automated test suite is configured.
-- `pnpm test` will exit with an error.
+- **Framework:** `vitest`
+- **Run tests:** `pnpm test`
+- **Watch mode:** `pnpm run test:watch`
+- **Location:** Tests are located in the `test/` directory.
 
 ## Contribution Guidelines
 - When adding new functionality, ensure proper types are exported in `src/types.d.ts` or within the module files.