Template Unit Tests

[vhscom]

Describe the problem

When scaffolding a new project I'd like a way to get started with Unit Testing using Vitest. This follows from the recent introduction of a template option to add Playwright.

Describe the proposed solution

Like with Playright, add an option to add Vitest for unit testing during project scaffolding.

Alternatives considered

Following the README instructions for https://github.com/nickbreaton/vitest-svelte-kit during set-up.

Importance

nice to have

Additional Information

Leaning into Vitest as opposed to Jest will help code created with SvelteKit projects to be more streamlined given an integration with the Vite built pipeline and help eliminate years of potentially inapplicable search results for React- and Vue-based test configurations.

[dominikg]

the way you can use vitest with sveltekit is going to improve. As long as it isn't stable (see also https://github.com/nickbreaton/vitest-svelte-kit#stability) it's not suitable as an option in create-svelte.

In the interim, a svelte-adder could be implemented: svelte-add/svelte-add#191

[vhscom]

I hear you. It's a bit of a chicken and the egg scenario. Kit is still in beta and I'm thinking more about man-hours spent trying to get Jest working with it as opposed to growing together with Vitest.

[rmunn]

I think writing an adder for https://github.com/svelte-add/svelte-add is the best way to solve the chicken-and-egg problem, or if not solve it completely at least get around the largest issue. Things shouldn't go into create-svelte until they're stable, but if there's an unofficial (or semi-official) adder package, people won't have the same expectation of stability. So any errors due to rapidly-moving targets won't reflect badly on Svelte-Kit for people trying it out for the first time. But at the same time, it could be mentioned in the documentation (in the FAQ section, perhaps) as a recommended way to set up unit testing that's simpler than using Jest.

[vhscom]

Closing due to low priority to reduce noise. Check out this Discord server for chat about configuring Vitest. 👍

[vhscom]

Further discussion and voting #5285