Implement stores and refills, improve testing

packages/web/src/app/__tests__/page.test.tsx

@@ -0,0 +1,22 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+
+vi.mock('next/link', () => ({
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  default: (props: any) => <a href={props.href}>{props.children}</a>,
+}));
+
+import HomePage from '../page';
+
+describe('HomePage', () => {
+  it('renders MeshiTrack heading', () => {
+    render(<HomePage />);
+    expect(screen.getByText('MeshiTrack')).toBeInTheDocument();
+  });
+
+  it('renders Sign In link to /login', () => {
+    render(<HomePage />);
+    const link = screen.getByRole('link', { name: 'Sign In' });
+    expect(link).toHaveAttribute('href', '/login');
+  });
+});