Add tests for AppFallback component

src/components/app-fallback/AppFallback.test.tsx

@@ -0,0 +1,26 @@
+import { render, screen, userEvent } from "@testing";
+import { AppFallback } from "./AppFallback";
+
+describe("<AppFallback />", () => {
+  it("Should render and handle click", async () => {
+    const resetErrorBoundaryMock = vi.fn();
+    render(
+      <AppFallback resetErrorBoundary={resetErrorBoundaryMock} error={""} />
+    );
+
+    expect(screen.getByText(/Oops! Something went wrong/)).toBeInTheDocument();
+    expect(
+      screen.getByText(/Sorry, an error has occurred. Please try again/)
+    ).toBeInTheDocument();
+
+    expect(
+      screen.getByRole("link", {
+        name: "Home page",
+      })
+    ).toHaveAttribute("href", "/");
+
+    await userEvent.click(screen.getByRole("button", { name: /Try again/ }));
+
+    expect(resetErrorBoundaryMock).toHaveBeenCalledTimes(1);
+  });
+});