--- title: From generated code to trusted code with a unit-test agent description: Microsoft's .NET team built an open-source polyglot unit-test agent called code-testing-generator, available in the dotnet/skills repository. Unlike a plain... canonical: https://daily.dev/posts/from-generated-code-to-trusted-code-with-a-unit-test-agent-ipcxebvho twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: From generated code to trusted code with a unit-test agent | daily.dev og:description: Microsoft's .NET team built an open-source polyglot unit-test agent called code-testing-generator, available in the dotnet/skills repository. Unlike a plain... og:url: https://daily.dev/posts/from-generated-code-to-trusted-code-with-a-unit-test-agent-ipcxebvho og:image: https://api.daily.dev/og/posts/IpcxeBvhO.png og:image:alt: From generated code to trusted code with a unit-test agent og:image:width: 1200 og:image:height: 630 og:locale: en --- [.NET Blog](https://daily.dev/sources/dotnet) [Read post](https://api.daily.dev/r/IpcxeBvhO) # [From generated code to trusted code with a unit-test agent](https://api.daily.dev/r/IpcxeBvhO "Go to post") Microsoft's .NET team built an open-source polyglot unit-test agent called code-testing-generator, available in the dotnet/skills repository. Unlike a plain Copilot prompt, the agent first learns the repository's language, test framework, conventions, and build commands before writing tests. It selects one of three execution paths (direct, single-pass, or iterative) based on task scope, then validates tests with lightweight mutation testing, assertion checks, and a full CI-compatible test run. Benchmarked against 152 internal tasks, the specialized agent achieved a 92.1% completion rate versus 78.9% for stock GitHub Copilot, with 63% fewer failures — gains concentrated on vague prompts. It supports .NET, Python, Go, TypeScript, Java, Rust, and more, and is usable today via GitHub Copilot CLI and VS Code. [#testing](/tags/testing "Check all #testing posts")[#github](/tags/github "Check all #github posts")[#ai-agents](/tags/ai-agents "Check all #ai-agents posts")[#.net](/tags/.net "Check all #.net posts") Jul 31•9m read time•From [devblogs.microsoft.com](https://api.daily.dev/r/IpcxeBvhO "devblogs.microsoft.com") [](https://api.daily.dev/r/IpcxeBvhO "Go to post") Table of contents [What happens after the prompt Copy link](https://api.daily.dev/r/IpcxeBvhO?a=what-happens-after-the-prompt "What happens after the prompt Copy link")[What we measured Copy link](https://api.daily.dev/r/IpcxeBvhO?a=what-we-measured "What we measured Copy link")[What we learned and what comes next Copy link](https://api.daily.dev/r/IpcxeBvhO?a=what-we-learned-and-what-comes-next "What we learned and what comes next Copy link")[Try the agent Copy link](https://api.daily.dev/r/IpcxeBvhO?a=try-the-agent "Try the agent Copy link") 22.3K Impressions14 Upvotes2 Comments Comment Bookmark Copy Share your thoughtsPost [](https://daily.dev/sources/dotnet) [.NET Blog](https://daily.dev/sources/dotnet "https://daily.dev/sources/dotnet") dotnet offers insights into .NET development, C# programming language, and cross-platform applicatio... 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Copy link WhatsApp Facebook X New Squad Copy linkShare with your friends 14 2 ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"From generated code to trusted code with a unit-test agent","url":"https://daily.dev/posts/from-generated-code-to-trusted-code-with-a-unit-test-agent-ipcxebvho","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/from-generated-code-to-trusted-code-with-a-unit-test-agent-ipcxebvho"},"datePublished":"2026-07-31T15:00:58.488Z","dateModified":"2026-08-07T19:31:07.670Z","description":"Microsoft's .NET team built an open-source polyglot unit-test agent called code-testing-generator, available in the dotnet/skills repository. 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