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断言路由与 JSON

检查状态码和响应正文

第 2 / 4 课13 个步骤

断言路由与 JSON 是 CoddyKit 上的免费 Flask Academy 课时。这是第 2 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 Flask Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flask Academy 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。

What You Assert

A good route test checks two things: the right status code and the right body. If both match, you know the endpoint behaves as promised.

Check the Status Code

The response carries a status_code attribute. A healthy page returns 200, so assert on it to confirm the route loaded without error.

resp = client.get('/')
assert resp.status_code == 200

Read the Raw Body

The full response body lives in resp.data as bytes. Decode it to text when you want to search for words inside an HTML page.

body = resp.data.decode()
assert 'Welcome' in body

Assert Text Is Present

To confirm a page shows the right content, check that a phrase appears in the body. The simple in operator is perfect for this.

assert b'Welcome' in resp.data

Parse a JSON Response

For API routes, call resp.get_json(). Flask parses the body into a Python dict or list so you can assert on real values.

data = resp.get_json()
assert data['name'] == 'Ada'

Assert on Dict Keys

Once you have the parsed dict, check individual keys and values. This proves your serializer returned exactly the fields you expect.

data = resp.get_json()
assert data['id'] == 1
assert 'email' in data

Check the Content Type

A JSON endpoint should advertise itself. Assert that resp.content_type includes application/json so clients parse it correctly.

assert 'application/json' in resp.content_type

Test a 404 Route

Error paths deserve tests too. Request a missing URL and assert the status is 404, proving your app fails gracefully.

resp = client.get('/nope')
assert resp.status_code == 404

Test a POST Endpoint

Send data with client.post and a json argument. Then assert the created status code, usually 201, and the returned body.

resp = client.post('/items', json={'name': 'pen'})
assert resp.status_code == 201

Assert on a JSON List

Collection endpoints return a list. Parse it, then assert its length or inspect items by index to verify the payload shape.

items = resp.get_json()
assert len(items) == 3
assert items[0]['id'] == 1

One Behavior per Test

Keep each test focused on a single behavior. Small, named tests make failures obvious and your suite far easier to read.

Quick Check

You hit a JSON API route in a test. How do you read its body?

在交互式课程中回答

Recap: Routes and JSON

You now assert on status codes, page text, and parsed JSON. With these moves you can pin down any route's behavior with confidence. ✅

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常见问题解答

「断言路由与 JSON」课时是免费的吗？

是的 — 「断言路由与 JSON」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 Flask Academy 课程的其余内容，请升级到 CoddyKit PRO。 Flask Academy 课程共包含 4 节课。

「断言路由与 JSON」这节课中我会学到什么？

检查状态码和响应正文你通过在浏览器中直接运行的动手代码来练习 Flask Academy，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 Flask Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flask Academy 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 2 节课，共 4 节。

「断言路由与 JSON」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 Flask Academy 课中编写并运行代码吗？

能。每节 Flask Academy 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。

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