test: add frontend test suite

vitest.config.ts

@@ -0,0 +1,16 @@
+import { defineConfig } from "vitest/config";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: "jsdom",
+    environmentOptions: {
+      jsdom: {
+        url: "http://localhost/",
+      },
+    },
+    setupFiles: "./src/test/setup.ts",
+    css: false,
+  },
+});