Update readme.md

Author: drcmda

readme.md

@@ -223,6 +223,7 @@ There is a vibrant and extensive eco system around three-fiber, full of librarie
 - [`@react-three/drei`](https://github.com/pmndrs/drei) – useful helpers, this is an eco system in itself
 - [`@react-three/gltfjsx`](https://github.com/pmndrs/gltfjsx) – turns GLTFs into JSX components
 - [`@react-three/postprocessing`](https://github.com/pmndrs/react-postprocessing) – post-processing effects
+- [`@react-three/test-renderer`](https://github.com/pmndrs/react-three-fiber/tree/master/packages/test-renderer) – for unit tests in node
 - [`@react-three/flex`](https://github.com/pmndrs/react-three-flex) – flexbox for react-three-fiber
 - [`@react-three/xr`](https://github.com/pmndrs/react-xr) – VR/AR controllers and events
 - [`@react-three/csg`](https://github.com/pmndrs/react-three-csg) – constructive solid geometry