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import { describe, it, expect, vi, beforeEach } from 'vitest';
import { store } from './store';
import { apiFetch } from './api';
import './main'; // Import to start the polling interval
// Mock api
vi.mock('./api', () => ({
apiFetch: vi.fn()
}));
// Mock router to avoid errors during loadMore
vi.mock('./router', () => ({
router: {
getCurrentRoute: () => ({ params: {}, query: new URLSearchParams() }),
updateQuery: vi.fn(),
navigate: vi.fn(),
addEventListener: vi.fn()
}
}));
describe('Infinite Scroll Polling', () => {
beforeEach(() => {
// Use real timers because the interval starts at module import time
vi.useRealTimers();
document.body.innerHTML = '<div id="main-content"></div>';
store.setItems(Array(50).fill({ _id: 1 }));
store.setHasMore(true);
store.setLoading(false);
vi.clearAllMocks();
});
it('should trigger loadMore via polling when near bottom', async () => {
const scrollRoot = document.getElementById('main-content')!;
// Mock scroll properties
Object.defineProperty(scrollRoot, 'scrollHeight', { value: 2000, configurable: true });
Object.defineProperty(scrollRoot, 'clientHeight', { value: 200, configurable: true });
// Use defineProperty for scrollTop to ensure it overrides native behavior in JSDOM
Object.defineProperty(scrollRoot, 'scrollTop', { value: 1750, configurable: true });
// Mock apiFetch response
vi.mocked(apiFetch).mockResolvedValue({
ok: true,
json: async () => []
} as Response);
// Wait for interval (3000ms) + buffer
await new Promise(resolve => setTimeout(resolve, 3100));
// Check if apiFetch was called
expect(apiFetch).toHaveBeenCalledWith(expect.stringContaining('/api/stream'));
});
it('should NOT trigger loadMore via polling when far from bottom', async () => {
const scrollRoot = document.getElementById('main-content')!;
Object.defineProperty(scrollRoot, 'scrollHeight', { value: 2000, configurable: true });
Object.defineProperty(scrollRoot, 'clientHeight', { value: 200, configurable: true });
Object.defineProperty(scrollRoot, 'scrollTop', { value: 100, configurable: true });
await new Promise(resolve => setTimeout(resolve, 3100));
expect(apiFetch).not.toHaveBeenCalled();
});
});
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