[docs] add link to vitest svelte example to test faq

[dominikg]

vitest is newish but works great for vite+svelte apps (and should even work with the old standard template). Link it here.

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• Prefix your PR title with [feat], [fix], [chore], or [docs].
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with npm test and lint the project with npm run lint

[benmccann]

I wonder if we should update the section that says "you can use a real browser powered by a library like Playwright, Puppeteer, or Cypress" to also say something along the lines of "The SvelteKit project creation wizard will setup Playwright for you as our preferred browser-based testing library"

[tanhauhau]

I wonder if we should update the section that says "you can use a real browser powered by a library like Playwright, Puppeteer, or Cypress" to also say something along the lines of "The SvelteKit project creation wizard will setup Playwright for you as our preferred browser-based testing library"

agree

[dummdidumm]

I'm against this, I wouldn't want to bless one specific solution here since we're in the context of Svelte here. At least I would only append that info, not replace the sentence and therefore remove the other options.

[dominikg]

Also not a fan of sprinkling mentions of sveltekit at random bits of the svelte documentation.
We should be looking at both svelte and kit docs to add cross references where feasible once kit hits 1.0

[dummdidumm]

Alright, then merge this as-is - we can always revisit this section later on.