Qodo Cover (5,576 Stars) AI Test Generation 2026: Automatically Generate Unit Tests and Boost Coverage

Qodo Cover (5,576 stars, formerly Cover Agent) is an AI-powered tool that generates unit tests and improves code coverage automatically. Here is how to add it to your repo.

💡 What You Will Learn

Qodo Cover (5,576 stars, formerly Cover Agent) is an AI-powered tool that generates unit tests and improves code coverage automatically. Here is how to add it to your repo.

## The short answer **Codium-ai/cover-agent** (5,576 stars, Python), now known as Qodo Cover, is an AI-powered tool for automated test generation and code coverage improvement. It reads your source files, understands how they are used, and writes unit tests - then runs them to verify they pass and actually increase coverage. ## How it works 1. **Analyze** the target file and its call graph 2. **Generate** tests with an LLM (OpenAI, Anthropic, or local models) 3. **Execute** the tests to check they pass 4. **Iterate** until coverage improves or budget is reached ## Quick start ```bash pip install qodo-cover export OPENAI_API_KEY=sk-... auto_test --project-path /path/to/repo \n --src-path src/calculator.py \n --test-path tests/ \n --test-command "pytest --cov=src/calculator" ``` It creates `test_calculator_*.py` files in the test directory and reports the before/after coverage delta. ## Practical tips - Start on your most critical modules - payment, auth, data parsing. - Review generated tests like any code; they are a starting point, not a replacement for human judgment. - Combine with a coverage gate in CI (e.g. fail below 80%) to keep coverage from regressing. ## FAQ **Does it only work with Python?** No - it supports multiple languages including Java, JavaScript, TypeScript and Go. **Can I use a local model?** Yes - it supports OpenAI-compatible endpoints, including Ollama and vLLM. **Is it free?** The CLI is open source; the Qodo platform adds team features.