How would you unit-test a Svelte date utility with Vitest?
This question tests isolating pure logic from Svelte and configuring Vitest. A good answer covers installing Vitest, co-locating a spec file, and asserting known inputs. A red flag is insisting you must mount a Svelte component to test a plain function.
This question tests whether you can isolate pure logic from Svelte components and configure Vitest in a Vite-based project. A strong answer walks through installing Vitest as a dev dependency, creating a spec file next to the utility, importing the date formatter, and writing assertions against known inputs and edge cases. It should also mention running tests via the Vitest CLI. A red flag is suggesting you need to mount a Svelte component, render to the DOM, or use SvelteKit-specific harnesses to test a plain JavaScript function.
Read the original → svelte.dev
- #svelte
- #vitest
- #testing
- #frontend
- #unit-testing
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