Basic testing setup

__tests__/Error.test.tsx

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+import { render, screen } from "@testing-library/react";
+import Error from "next/error";
+
+it("renders a not found message on 404 code", () => {
+    render(<Error statusCode={404} />);
+    expect(screen.getByText(/this page could not be found/i)).toBeVisible();
+});
+
+it("renders the correct status code", () => {
+    const code = Math.floor(Math.random() * 500) + 100;
+    render(<Error statusCode={code} />);
+    expect(screen.getByText(code)).toBeVisible();
+});