# Puneet Khanduri - Diffy: Testing Services Without Writing Tests (Highlights) ![rw-book-cover|256](https://readwise-assets.s3.amazonaws.com/static/images/article1.be68295a7e40.png) ## Metadata **Cover**:: https://readwise-assets.s3.amazonaws.com/static/images/article1.be68295a7e40.png **Source**:: #from/readwise **Zettel**:: #zettel/fleeting **Status**:: #x **Authors**:: [[Puneet Khanduri]] **Full Title**:: Diffy: Testing Services Without Writing Tests **Category**:: #articles #readwise/articles **Category Icon**:: 📰 **URL**:: [blog.twitter.com](https://blog.twitter.com/engineering/en_us/a/2015/diffy-testing-services-without-writing-tests.html) **Host**:: [[blog.twitter.com]] **Highlighted**:: [[2021-02-12]] **Created**:: [[2022-09-26]] ## Highlights - Today, we’re excited to release Diffy, an open-source tool that automatically catches bugs in Apache Thrift and HTTP-based services. https://github.com/opendiffy/diffy - Diffy finds potential bugs in your service by running instances of your new and old code side by side. - It then compares the responses - Diffy acts as a proxy which accepts requests drawn from any source you provide and multicasts each of these requests to three different service instances: