vitest-testing

| app/composables/ .ts | tests/app/composables/ .test.ts | | app/components/ .vue | app/components/tests/ .test.ts (DOM tests) OR tests/app/components/ .test.ts (logic-only) | | app/utils/ .ts | tests/app/utils/ .test.ts | | services/ .ts | tests/services/ .test.ts | | utils/ .ts | tests/utils/ .test.ts |

| terraform/lambda/src/ /index.ts | terraform/lambda/src/ /tests/index.test.ts |

Use tests/ co-location only for component DOM tests and Lambda handlers. Everything else goes in the top-level tests/ mirror tree.

Write and run Vitest unit tests for this Nuxt 4 project. Auto-triggers when creating or modifying composables, components, services, utils, or Lambda handlers. Use this skill whenever writing tests, adding test coverage, testing new features, fixing bugs (write regression test first), or when the user mentions testing, unit tests, vitest, TDD, coverage, or test coverage. Also use when creating any new file in app/composables/, app/components/, app/utils/, services/, or terraform/lambda/src/. Source: ralphcrisostomo/nuxt-development-skills.