# jest | Jest | Knowledge Base | Instagit

Delightful JavaScript Testing.

GitHub Stars: 45.3k

Repository: https://github.com/jestjs/jest

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## Articles

### [Enzyme vs React Testing Library: Core Differences for Modern React Component Testing](/jestjs/jest/enzyme-vs-react-testing-library-react-testing-differences)

Discover core differences between Enzyme and React Testing Library for component testing. Understand black-box vs white-box approaches and their impact on maintenance.

- Tags: deep-dive
- Published: 2026-02-21

### [When to Use act in React Testing Library with Jest: A Complete Guide](/jestjs/jest/when-to-use-react-testing-library-act)

Learn when to use act in React Testing Library with Jest. Wrap state updates and effects with act() for stable DOM and reliable tests. Avoid warnings and flaky test outcomes.

- Tags: how-to-guide
- Published: 2026-02-16