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import { beforeEach, describe, expect, it } from 'vitest';
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import { loadScript } from '../resources';
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const testJsPath =
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'https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js';
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describe('loadScript', () => {
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beforeEach(() => {
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// 每个测试前清空 head,保证环境干净
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document.head.innerHTML = '';
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});
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it('should resolve when the script loads successfully', async () => {
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const promise = loadScript(testJsPath);
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// 此时脚本元素已被创建并插入
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const script = document.querySelector(
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`script[src="${testJsPath}"]`,
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) as HTMLScriptElement;
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expect(script).toBeTruthy();
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// 模拟加载成功
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script.dispatchEvent(new Event('load'));
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// 等待 promise resolve
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await expect(promise).resolves.toBeUndefined();
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});
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it('should not insert duplicate script and resolve immediately if already loaded', async () => {
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// 先手动插入一个相同 src 的 script
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const existing = document.createElement('script');
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existing.src = 'bar.js';
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document.head.append(existing);
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// 再次调用
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const promise = loadScript('bar.js');
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// 立即 resolve
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await expect(promise).resolves.toBeUndefined();
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// head 中只保留一个
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const scripts = document.head.querySelectorAll('script[src="bar.js"]');
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expect(scripts).toHaveLength(1);
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});
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it('should reject when the script fails to load', async () => {
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const promise = loadScript('error.js');
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const script = document.querySelector(
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'script[src="error.js"]',
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) as HTMLScriptElement;
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expect(script).toBeTruthy();
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// 模拟加载失败
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script.dispatchEvent(new Event('error'));
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await expect(promise).rejects.toThrow('Failed to load script: error.js');
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});
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it('should handle multiple concurrent calls and only insert one script tag', async () => {
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const p1 = loadScript(testJsPath);
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const p2 = loadScript(testJsPath);
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const script = document.querySelector(
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`script[src="${testJsPath}"]`,
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) as HTMLScriptElement;
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expect(script).toBeTruthy();
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// 触发一次 load,两个 promise 都应该 resolve
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script.dispatchEvent(new Event('load'));
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await expect(p1).resolves.toBeUndefined();
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await expect(p2).resolves.toBeUndefined();
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// 只插入一次
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const scripts = document.head.querySelectorAll(
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`script[src="${testJsPath}"]`,
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);
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expect(scripts).toHaveLength(1);
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});
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});
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