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import { describe, it, expect } from 'vitest';
import { createFeedItem } from '../components/FeedItem';
import type { Item } from '../types';
function makeItem(id: number): Item {
return {
_id: id,
feed_id: 1,
title: `Test Item ${id}`,
url: `https://example.com/item/${id}`,
description: `<p>Description for item ${id} with <b>bold</b> and <a href="https://example.com">link</a></p>`,
publish_date: '2024-01-01T00:00:00Z',
read: id % 3 === 0,
starred: id % 5 === 0,
feed_title: 'Test Feed',
};
}
describe('renderItems performance', () => {
it('createFeedItem renders 100 items under 50ms', () => {
const items = Array.from({ length: 100 }, (_, i) => makeItem(i));
const start = performance.now();
const html = items.map(item => createFeedItem(item)).join('');
const elapsed = performance.now() - start;
expect(html).toBeTruthy();
expect(html).toContain('feed-item');
expect(elapsed).toBeLessThan(50);
});
it('createFeedItem renders 500 items under 200ms', () => {
const items = Array.from({ length: 500 }, (_, i) => makeItem(i));
const start = performance.now();
const html = items.map(item => createFeedItem(item)).join('');
const elapsed = performance.now() - start;
expect(html).toBeTruthy();
expect(elapsed).toBeLessThan(200);
});
it('createFeedItem renders 1000 items under 100ms', () => {
const items = Array.from({ length: 1000 }, (_, i) => makeItem(i));
const start = performance.now();
const results: string[] = [];
for (const item of items) {
results.push(createFeedItem(item));
}
const elapsed = performance.now() - start;
expect(results.length).toBe(1000);
expect(elapsed).toBeLessThan(100);
});
it('DOM insertion of 100 items under 500ms', () => {
const items = Array.from({ length: 100 }, (_, i) => makeItem(i));
const html = items.map(item => createFeedItem(item)).join('');
const container = document.createElement('ul');
document.body.appendChild(container);
const start = performance.now();
container.innerHTML = html;
const elapsed = performance.now() - start;
expect(container.children.length).toBe(100);
expect(elapsed).toBeLessThan(500);
document.body.removeChild(container);
});
it('DOM insertion of 500 items under 1400ms', () => {
const items = Array.from({ length: 500 }, (_, i) => makeItem(i));
const html = items.map(item => createFeedItem(item)).join('');
const container = document.createElement('ul');
document.body.appendChild(container);
const start = performance.now();
container.innerHTML = html;
const elapsed = performance.now() - start;
expect(container.children.length).toBe(500);
expect(elapsed).toBeLessThan(1400);
document.body.removeChild(container);
});
});
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