December 2017
Intermediate to advanced
329 pages
6h 9m
Chinese
Content preview from React学习手册
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测试
｜
235
让我们对
color
的
Reducer
函数进行适当修改，以便可以通过测试程序的验证。我们将
会使用扩展运算符在覆盖评分记录之前创建一个
State
对象的拷贝：
case 'RATE_COLOR':
return {
...state,
rating: action.rating
}
现在我们没有修改
State
对象，两个测试都应该可以通过：
$
jest
PASS __tests__/store/reducers/color.test.js
color Reducer
✓
ADD_COLOR success (3ms)
✓
RATE_COLOR success
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 0.782s, estimated 1s
Ran all test suites.
这个过程代表了一个典型的
TDD
周期。我们首先编写测试代码，然后编写可以通过测
试的项目代码，最后对项目代码和测试代码进行重构。在使用
JavaScript
工作时，该
方法特别高效，特别对于
Redux
来说。
测试
Store
如果
Store
能够正常运作，那么用户的应用程序也很有可能可以正常工作。测试
Store
的过程会创建一个和
Reducer
有关的
Store
，注入假想的
State
，分发
Action
，最后验证
结果。
在测试
Store
时，用户可以集成
Action
生成器，将
Store ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.