Get minimal vitest working with SvelteKit

package.json

@@ -13,6 +13,9 @@
 	"devDependencies": {
 		"@sveltejs/adapter-auto": "^2.0.0",
 		"@sveltejs/kit": "^1.20.4",
+		"@testing-library/jest-dom": "^6.1.3",
+		"@testing-library/svelte": "^4.0.3",
+		"jsdom": "^22.1.0",
 		"svelte": "^4.0.5",
 		"svelte-check": "^3.4.3",
 		"tslib": "^2.4.1",

src/Demo.svelte

@@ -0,0 +1 @@
+<p>Demo URL: </p>

src/Demo.test.ts

@@ -0,0 +1,11 @@
+import { expect, it } from "vitest";
+import "@testing-library/jest-dom";
+import { render, screen } from "@testing-library/svelte";
+import Demo from "./Demo.svelte";
+
+it("can render demo", async () => {
+  const { container } = render(Demo);
+  const paragraph = container.querySelector("p");
+  expect(paragraph).toHaveTextContent("Demo URL:")
+});
+

vite.config.ts

@@ -4,6 +4,8 @@ import { defineConfig } from 'vitest/config';
 export default defineConfig({
 	plugins: [sveltekit()],
 	test: {
-		include: ['src/**/*.{test,spec}.{js,ts}']
+		include: ['src/**/*.{test,spec}.{js,ts}'],
+		globals: true,
+		environment: 'jsdom',
 	}
 });