1Highest rated
Qodo (ex-CodiumAI)Development & no-code
AI agent specialised in code review and test generation that integrates directly into pull requests
Read the review →Best AI tools for writing tests (developer)
5 tools selected and reviewed
Writing unit tests is essential but rarely the most stimulating part of the job, and often gets skipped for lack of time. These AIs generate relevant tests directly from your code, covering edge cases easily forgotten.
Our ranking favours tools specialised in test generation, complemented by generalised copilots.
Our quick recommendation
2Excellent choice
GitHub CopilotDevelopment & no-code
The AI assistant that completes and writes code in your editor.
Read the review →3Worth a look
CursorDevelopment & no-code
The code editor reimagined around AI.
Read the review →All results
| Tool | Best for | Price | FR | Level | Verdict | Rating | |
|---|---|---|---|---|---|---|---|
| Qodo (ex-CodiumAI) | AI agent specialised in code review and test generation that integrates directly into pull requests | Freemium | — | Intermediate | Good choice | ★ 4.1 | |
| GitHub Copilot | The AI assistant that completes and writes code in your editor. | Paid | 🇫🇷 | Intermediate | Very good | ★ 4.6 | |
| Cursor | The code editor reimagined around AI. | Freemium | 🇫🇷 | Intermediate | Excellent | ★ 4.7 | |
 Windsurf (Codeium) | Codeium's AI IDE combining unlimited autocomplete and Cascade agent for continuous code changes | Freemium | — | Intermediate | Very good | ★ 4.3 | |
 Sourcegraph Cody | Enterprise AI assistant that understands your entire multi-repo codebase for ultra-precise answers | Paid | — | Advanced | Good choice | ★ 3.9 |
Frequently asked questions
What is the best AI for writing unit tests?
Qodo (formerly CodiumAI) is designed specifically to generate relevant tests from your code, edge cases included. GitHub Copilot and Cursor also generate correct tests on request, but more generally.
Do these tools really increase code coverage?
Yes, Qodo (formerly CodiumAI) analyses untested code branches and proposes targeted tests to fill coverage gaps.
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