Comparing
pytest: simple powerful testing with Python
Next generation testing framework powered by Vite
| Metric | pytest | vitest |
|---|---|---|
| Ecosystem | Python | npm |
| Difficulty | Beginner ✓ | Advanced |
| Weekly downloads | 0 | 44.5M↑ |
| Latest version | v9.0.2 | v4.1.2 |
| Recipes | 1 | 1 |
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vitest only
Use pytest for any Python project with tests. It's the de facto standard — most libraries, frameworks, and CI pipelines assume pytest. Its plugin ecosystem covers everything from coverage (pytest-cov) to async tests (pytest-asyncio) to parameterisation.
Use Vitest for any Vite-based project (React, Vue, Svelte) that needs unit or integration tests. It's also a good Jest replacement in non-Vite Node projects that want faster test execution and native ES module support.
For extremely simple one-off scripts where adding a dependency feels heavy, unittest is built into Python. For property-based testing, add Hypothesis on top of pytest rather than replacing it.
For Next.js projects, Jest is still the recommended and better-documented choice. Vitest's browser mode (for running tests in a real browser) is still maturing — for end-to-end browser tests, use Playwright or Cypress.
pytest
vitest