chore(deps): update vitest monorepo to v4 (major) (#14789)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Tee Ming <[email protected]>

Author: renovate[bot]

packages/adapter-auto/test/adapters.spec.js

@@ -1,5 +1,5 @@
 import { assert, test } from 'vitest';
-import { adapters } from 'adapters.js';
+import { adapters } from '../adapters.js';
 import { existsSync, readFileSync } from 'node:fs';
 
 test('adapter versions are up to date', () => {

packages/adapter-vercel/test/utils.spec.js

@@ -2,7 +2,9 @@ import { assert, test, describe } from 'vitest';
 import { get_pathname, parse_isr_expiration, pattern_to_src, resolve_runtime } from '../utils.js';
 
 // workaround so that TypeScript doesn't follow that import which makes it pick up that file and then error on missing import aliases
-const { parse_route_id } = await import('../../kit/src/' + 'utils/routing.js');
+const { parse_route_id } = await import(
+	new URL('../../kit/src/' + 'utils/routing.js', import.meta.url).href
+);
 
 /**
  * @param {import('@sveltejs/kit').RouteDefinition<any>['segments']} segments

packages/kit/kit.vitest.config.js

@@ -15,11 +15,8 @@ export default defineConfig({
 		alias: {
 			'__sveltekit/paths': fileURLToPath(new URL('./test/mocks/path.js', import.meta.url))
 		},
-		poolOptions: {
-			threads: {
-				singleThread: true
-			}
-		},
+		pool: 'threads',
+		maxWorkers: 1,
 		include: ['src/**/*.spec.js'],
 		exclude: [
 			'**/node_modules/**',

packages/kit/test/apps/basics/package.json

@@ -25,7 +25,7 @@
 		"@opentelemetry/sdk-trace-node": "catalog:",
 		"@sveltejs/kit": "workspace:^",
 		"@sveltejs/vite-plugin-svelte": "catalog:",
-		"@vitest/browser": "catalog:",
+		"@vitest/browser-playwright": "catalog:",
 		"svelte": "catalog:",
 		"svelte-check": "catalog:",
 		"test-redirect-importer": "workspace:*",

packages/kit/test/apps/basics/vite.config.js

@@ -1,5 +1,6 @@
 import * as path from 'node:path';
 import { sveltekit } from '@sveltejs/kit/vite';
+import { playwright } from '@vitest/browser-playwright';
 import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
@@ -25,15 +26,13 @@ export default defineConfig({
 				extends: './vite.config.js',
 				test: {
 					name: 'client',
-					environment: 'browser',
 					browser: {
 						enabled: true,
-						provider: 'playwright',
+						provider: playwright(),
 						instances: [{ browser: 'chromium' }],
 						headless: true
 					},
-					include: ['unit-test/**/*.spec.js'],
-					setupFiles: ['./vitest-setup-client.ts']
+					include: ['unit-test/**/*.spec.js']
 				}
 			}
 		]

packages/kit/test/apps/basics/vitest-setup-client.ts

@@ -1,7 +1,7 @@
 import * as path from 'node:path';
 import { sveltekit } from '@sveltejs/kit/vite';
 
-/** @type {import('vitest/config').UserConfig} */
+/** @type {import('vitest/config').ViteUserConfig} */
 const config = {
 	build: {
 		minify: false