add vitest and testing-library

package.json

@@ -18,6 +18,8 @@
     "@sveltejs/adapter-static": "^1.0.0-next.28",
     "@sveltejs/kit": "^1.0.0-next.288",
     "@sveltejs/vite-plugin-svelte": "^1.0.0-next.38",
+    "@testing-library/svelte": "^3.1.1",
+    "@testing-library/user-event": "^13.5.0",
     "eslint": "^8.10.0",
     "eslint-config-prettier": "^8.4.0",
     "eslint-plugin-svelte3": "^3.4.1",
@@ -25,7 +27,9 @@
     "prettier-plugin-svelte": "^2.6.0",
     "standard-version": "^9.3.2",
     "storybook-builder-vite": "0.1.21",
-    "svelte": "^3.46.4"
+    "svelte": "^3.46.4",
+    "vitest": "^0.9.3",
+    "vitest-svelte-kit": "^0.0.6"
   },
   "dependencies": {
     "@storybook/addon-essentials": "^6.4.19",

vitest.config.js

@@ -0,0 +1,9 @@
+import { extractFromSvelteConfig } from "vitest-svelte-kit";
+
+export default extractFromSvelteConfig().then((config) => ({
+    ...config,
+    test: {
+      globals: true,
+      environment: "jsdom",
+    },
+  }));