Microsoft Open Sources code-testing-generator: a Polyglot Unit-Test Agent That Hits 92.1% Task Completion Versus 78.9% for Stock Copilot

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Microsoft has open sourced code-testing-generator, a polyglot agent that writes unit tests and then proves they work. It ships in the dotnet-test plugin inside the MIT-licensed dotnet/skills repository.

The agent targets a gap that coding assistants usually leave open. A prompt like ‘generate unit tests’ does not say which framework, file location or assertions to use. code-testing-generator settles those decisions by reading the repository before it writes anything. It then plans, writes, runs and checks the tests it produces. On Microsoft’s internal 152-task benchmark, it completed 140 tasks against 120 for stock GitHub Copilot. Both setups used the same model and prompts.

Is it deployable

Yes. It is an agent definition along with skills, not a hosted service, so it runs inside your existing coding agent and code stays local.

Company stage: viable from solo maintainers upward. Startups and mid-market teams gain most, because the agent supplies repository research a small team has no time to encode. Enterprises can fork the language guidance to match internal frameworks.

Industries: regulated or audit-heavy software estates — financial services, healthcare, insurance, public sector — plus platform teams paying down legacy test debt.

Applications: backfilling tests on untested modules, generating tests for a pull-request diff, raising coverage before a release gate, and standardising conventions across polyglot monorepos.

What the agent actually does

It coordinates work through a Research-Plan-Implement (RPI) pipeline. It searches the repository for code needing …

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