Ok, make a reusable testing component

vitest.setup.js

@@ -1 +1,19 @@
 import "@testing-library/jest-dom/vitest";
+
+import { cleanup } from "@testing-library/react";
+import { afterEach, vi } from "vitest";
+
+afterEach(() => {
+  cleanup();
+});
+
+// implement a couple of common formatters mocked in next-i18next
+vi.mock("next-i18next", () => ({
+  useTranslation: () => ({
+    t: (key, opts) => {
+      if (key === "common.number") return String(opts?.value ?? "");
+      if (key === "common.percent") return String(opts?.value ?? "");
+      return key;
+    },
+  }),
+}));