# Rails testing on autopilot: Building an agent that writes what developers won't

DevFeed: [Rails testing on autopilot: Building an agent that writes what developers won't](<https://devfeed.tech/articles/rails-testing-on-autopilot-building-an-agent-that-writes-what-developers-won-t-7110.md>)

Original publisher: [Read original article](<https://mistral.ai/news/rails-testing-on-autopilot-building-an-agent-that-writes-what-developers-wont/>)

Published: 2026-03-11T12:00:00Z

Content type: article

Language: en

Sources: [Mistral AI Blog](<https://devfeed.tech/sources/mistral-ai-blog.md>)

Topics: [AI-assisted coding](<https://devfeed.tech/topics/ai-assisted-coding.md>), [CI/CD](<https://devfeed.tech/topics/cicd.md>), [ci](<https://devfeed.tech/topics/ci.md>)

Tags: [agent](<https://devfeed.tech/tags/agent.md>), [autonomous](<https://devfeed.tech/tags/autonomous.md>), [ci-cd](<https://devfeed.tech/tags/ci-cd.md>), [code](<https://devfeed.tech/tags/code.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [ruby](<https://devfeed.tech/tags/ruby.md>), [testing](<https://devfeed.tech/tags/testing.md>)

## AI overview

Mistral describes an autonomous coding agent that generates and improves RSpec tests for large Ruby on Rails codebases. The agent validates tests against style and coverage requirements and runs in a CI/CD pipeline.

## Source excerpt

The most powerful AI platform for enterprises. Customize, fine-tune, and deploy AI assistants, autonomous agents, and multimodal AI with open models.