Backend and frontend testing stacks (pytest + vitest) and a few initial tests.

frontend/vite.config.js

@@ -7,5 +7,9 @@ export default defineConfig({
     proxy: {
       "/api": "http://localhost:8000"
     }
+  },
+  test: {
+    environment: "jsdom",
+    setupFiles: "./src/test/setupTests.js"
   }
 });