Today, we’re excited to release Diffy, an open-source tool that automatically catches bugs in Apache Thrift and HTTP-based services. It needs minimal setup and is able to catch bugs without requiring developers to write many tests. Service-oriented architectures like our platform see a large number of services evolve at a very fast pace. As new features are added with each commit, existing code is
![Diffy: Testing services without writing tests](https://cdn-ak-scissors.b.st-hatena.com/image/square/a7dfbba80c1b2e3d08e53178d335285f8dc68548/height=288;version=1;width=512/https%3A%2F%2Fcdn.cms-twdigitalassets.com%2Fcontent%2Fdam%2Fblog-twitter%2Fengineering%2Fen_us%2Fmain-template-assets%2FEng_EXPLORE_Pink.png.twimg.768.png)