React Testing Library vs Enzyme vs Storybook — UK Component Testing (2025)
React Testing Library (RTL) is the right default for all UK React component testing — tests user behaviour not implementation, accessible-query approach naturally tests WCAG compliance (NHS DTAC Domain 5 evidence), and is the official React and Next.js recommendation. Enzyme is legacy — unmaintained for React 18+ and should not be used in new projects. Storybook is a complementary visual development tool, not a replacement for RTL testing. React component testing strategy affects UK WCAG accessibility evidence quality and developer confidence in component behaviour. Here is the 2025 UK position.
| Factor | React Testing Library | Enzyme | Storybook |
|---|---|---|---|
| React 18 support | ✅ Full React 18 support | ❌ Not maintained for React 18 | ✅ Full React 18 support |
| WCAG accessibility testing | ✅ Accessible queries — getByRole, getByLabelText test WCAG semantics | Not accessibility-aware | ✅ Storybook a11y addon — visual check |
| NHS DTAC Domain 5 evidence | ✅ Behaviour tests = user journey evidence | Not suitable | Storybook stories = visual evidence |
| Tests user behaviour vs implementation | ✅ Behaviour — what user sees | Implementation — component internals | Visual — what component looks like |
| Next.js / App Router support | ✅ Full support | Not supported | ✅ Storybook 7+ supports Server Components |
| Async/await testing | ✅ waitFor, findBy — excellent async | Limited | Not applicable |
| UK developer familiarity | ✅ Industry standard — React team recommendation | Declining — legacy projects only | ✅ Widely used |
| ClickMasters default | ✅ All UK React projects | Not recommended | Complementary — design system docs |
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