Edge Computing with Cloudflare Workers & Deno · 课时

测试 Deno 应用

使用内置测试运行器、断言和模拟功能，为 Deno 应用编写并运行测试，确保边缘代码可靠。

第 4 / 4 课13 个步骤

测试 Deno 应用 是 CoddyKit 上的免费 Edge Computing with Cloudflare Workers & Deno 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Edge Computing with Cloudflare Workers & Deno 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Edge Computing with Cloudflare Workers & Deno 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Built-in Testing

Deno ships with a built-in test runner — no extra framework or config needed. Just write tests and run deno test.

Your First Test

Deno.test('adds numbers', () => {
  const sum = 2 + 3;
  if (sum !== 5) throw new Error('wrong');
});

The Assertions Module

Use the standard library's assertions for clearer failures instead of manual throws.

import { assertEquals } from 'jsr:@std/assert';

Deno.test('math', () => {
  assertEquals(2 + 3, 5);
});

Running Tests

Run all tests in your project. Deno discovers files ending in _test.ts or .test.ts automatically.

deno test
deno test --allow-net

Async Tests

Tests can be async — just return a promise or mark the function async. Deno awaits it before reporting.

Deno.test('fetches data', async () => {
  const res = await fetch('https://example.com');
  assertEquals(res.status, 200);
});

Test Steps

Break a complex test into named steps with t.step for clearer output and partial results.

Deno.test('user flow', async (t) => {
  await t.step('signup', () => {});
  await t.step('login', () => {});
});

Permissions in Tests

Tests obey Deno's permission model. A test needing network access fails without --allow-net, so you test real security boundaries.

Mocking & Spies

The std testing module provides spies, stubs, and mocks to isolate units from external services.

import { spy } from 'jsr:@std/testing/mock';
const log = spy(console, 'log');

Snapshot Testing

Deno's assertSnapshot stores expected output and compares future runs against it — great for stable structured responses.

Coverage Reports

Measure how much code your tests exercise with the built-in coverage tools.

deno test --coverage=cov
deno coverage cov

Testing Edge Logic

Structure handlers as pure functions of a Request so you can test them without a running server — ideal for edge code.

export function handler(req: Request) {
  return new Response('ok');
}

Quick Check

Test your Deno testing knowledge.

在交互式课程中回答

Recap

You learned to write tests with Deno.test, use std assertions, handle async and steps, respect permissions, mock dependencies, and measure coverage — keeping your edge code reliable.

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常见问题解答

「测试 Deno 应用」课时是免费的吗？

是的 — 「测试 Deno 应用」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Edge Computing with Cloudflare Workers & Deno 课程的其余内容，请升级到 CoddyKit PRO。 Edge Computing with Cloudflare Workers & Deno 课程共包含 4 节课。

「测试 Deno 应用」这节课中我会学到什么？

使用内置测试运行器、断言和模拟功能，为 Deno 应用编写并运行测试，确保边缘代码可靠。你通过在浏览器中直接运行的动手代码来练习 Edge Computing with Cloudflare Workers & Deno，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Edge Computing with Cloudflare Workers & Deno 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Edge Computing with Cloudflare Workers & Deno 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「测试 Deno 应用」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Edge Computing with Cloudflare Workers & Deno 课中编写并运行代码吗？

能。每节 Edge Computing with Cloudflare Workers & Deno 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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