# Testing signals — shadcn-ui/ui

> Canonical page: https://codevetter.com/unpack/ui/testing-signals

# Testing signals — shadcn-ui/ui

Scanned commit 98a1fe67b439324ddc857f47fbdce056600a4329 (2026-09-21). Generated by codevetter codevetter 1.12.0 on 2026-09-22.

Vitest is the single framework. packages/shadcn has dense colocated unit tests plus fixture dirs; packages/tests is a heavier e2e layer that executes the built CLI against copied project fixtures and a stub registry server; @shadcn/react adds browser-mode tests. apps/v4 has only a handful of tests and no coverage config exists anywhere. The root `pnpm test` gate requires building the registry and running the v4 dev server on :4000.
- Root vitest workspace = ./vitest.config.ts (excludes node_modules/fixtures/templates/packages/tests) + ./packages/tests/vitest.config.ts; vite-tsconfig-paths plugin resolves the '@/src/*' alias used throughout packages/shadcn. — [vitest.workspace.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/vitest.workspace.ts) [vitest.config.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/vitest.config.ts)
- packages/shadcn unit tests are colocated *.test.ts across commands/, registry/, utils/, migrations/, preflights/, preset/ (e.g. resolver.test.ts 2588 LOC, update-files.test.ts 2634 LOC) with 8s testTimeout; fixtures live in test/fixtures (config-*, frameworks/*, project-* variants). — [packages/shadcn/vitest.config.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/vitest.config.ts) [packages/shadcn/src/registry/resolver.test.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/src/registry/resolver.test.ts) [packages/shadcn/test/fixtures](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/test/fixtures)
- HTTP mocking uses msw (devDep); proxy.ts deliberately keeps globalThis.fetch because MSW's Node adapter patches it — importing undici fetch would bypass interception and break registry tests (documented in-code). — [packages/shadcn/package.json](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/package.json) [packages/shadcn/src/registry/proxy.ts#L144-147](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/src/registry/proxy.ts#L144-L147)
- packages/tests e2e: vitest globals, 120s timeouts, maxConcurrency 4, globalSetup src/utils/setup.ts; helpers copy fixtures (next-app, vite-app, remix-app, vite-monorepo-imports, registry, etc.) to a temp dir and run `node packages/shadcn/dist/index.js` via execa with CI=true. — [packages/tests/vitest.config.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/tests/vitest.config.ts) [packages/tests/src/utils/helpers.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/tests/src/utils/helpers.ts) [packages/tests/src/utils/setup.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/tests/src/utils/setup.ts)
- e2e registry isolation: src/utils/registry.ts spins a real http server (default port 4444) serving fake /r endpoints incl. registries.json; REGISTRY_URL env (default http://localhost:4000/r) points tests at the v4 dev server for the full suite. — [packages/tests/src/utils/registry.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/tests/src/utils/registry.ts) [packages/tests/src/utils/helpers.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/tests/src/utils/helpers.ts)
- e2e coverage: packages/tests/src/tests covers init, add, apply, view, search, registries, typeset — asserting written components.json shape, lib/utils.ts content, package.json deps, and globals.css variables. — [packages/tests/src/tests/init.test.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/tests/src/tests/init.test.ts)
- CI test.yml runs three jobs per PR: `pnpm test` (root — which itself spins up v4 on :4000), `pnpm --filter=@shadcn/react test`, `pnpm --filter=@shadcn/helpers test`, all on Node 22 + pnpm 10.33.4; browser-tests.yml additionally runs @shadcn/react browser tests only when packages/react changes. — [.github/workflows/test.yml](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/.github/workflows/test.yml) [.github/workflows/browser-tests.yml](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/.github/workflows/browser-tests.yml) [package.json](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/package.json)
- @shadcn/react has dedicated browser tests (vitest.browser.config.ts + vitest.browser.setup.ts) including a perf browser test for message-scroller; @shadcn/helpers has colocated unit tests for core/ai-sdk modules. — [packages/react/vitest.browser.config.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/react/vitest.browser.config.ts) [packages/react/src/message-scroller/message-scroller.perf.browser.test.tsx](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/react/src/message-scroller/message-scroller.perf.browser.test.tsx) [packages/helpers/src/core/chat.test.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/helpers/src/core/chat.test.ts)
- apps/v4 is sparsely tested: only a few *.test.ts exist (registry/calendar.test.ts, registry/config.test.ts, app/r/registries.json/route.test.ts); the Next.js UI, create-flow routes, and build-registry.mts pipeline have no direct tests — correctness relies on registry:health/monitor CI jobs. — [apps/v4/registry/calendar.test.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/apps/v4/registry/calendar.test.ts) [apps/v4/app/r/registries.json/route.test.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/apps/v4/app/r/registries.json/route.test.ts) [apps/v4/scripts/monitor-registries.mts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/apps/v4/scripts/monitor-registries.mts)
- Registry integrity is CI-gated: validate-registries.yml runs scripts/validate-registries.mts (and blocks reserved namespaces) when apps/v4/registry/directory.json changes; monitor-registries.yml runs phased health prepare/check/publish scripts. — [.github/workflows/validate-registries.yml](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/.github/workflows/validate-registries.yml) [apps/v4/scripts/validate-registries.mts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/apps/v4/scripts/validate-registries.mts) [apps/v4/registry/directory.json](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/apps/v4/registry/directory.json)
- No coverage tooling, snapshots exist only for transformers/updaters (__snapshots__ dirs), and there are no tests for the MCP tools layer (mcp/utils.test.ts exists but server handlers are untested) — likely gap areas. (inferred) — [packages/shadcn/src/utils/transformers/__snapshots__](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/src/utils/transformers/__snapshots__) [packages/shadcn/src/mcp/utils.test.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/src/mcp/utils.test.ts) [packages/shadcn/src/mcp/index.ts](https://github.com/shadcn-ui/ui/blob/98a1fe67b439324ddc857f47fbdce056600a4329/packages/shadcn/src/mcp/index.ts)

Every claim links to its cited files at the pinned commit. Citations identify source evidence; they do not establish runtime correctness. Independent CodeVetter scan — not reviewed by upstream maintainers.

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