Maybe I missed it, but I think you need to add @testing-library/jest-dom to the compileOptions/types in tsconfig.json, other Wallaby shows the Carousel tests with a “document not defined” error
Hmm… I’m able to run the tests in Wallaby without that bit of configuration. I found this issue: `ReferenceError: document is not defined` for SvelteKit + Vitest + `@testing-library/svelte` test · Issue #3283 · wallabyjs/public · GitHub Can you try running the “Wallaby.js: Force Core Update” command and see if you still get the error?