41 lines
983 B
Markdown
41 lines
983 B
Markdown
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---
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title: Testing with Chaijs
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localeTitle: 用Chaijs测试
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---
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[Chai](http://chaijs.com)是Node.js的测试库。
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### 安装
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您可以通过npm在项目中安装Chai。
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```
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npm install chai
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```
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##### 专家提示
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使用\*作为版本标记在_package.json的_ devDependencies中添加Chai。这样，您始终拥有最新版本。
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```
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"devDependencies": {
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"chai": "*"
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}
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```
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### 如何使用
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#### 断言
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您可以使用_assert_来检查您的测试是否表现良好。
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```
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var assert = require('chai').assert, foo = 'bar', beverages = { tea: [ 'chai', 'matcha', 'oolong' ] };
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assert.typeOf(foo, 'string'); // without optional message
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assert.typeOf(foo, 'string', 'foo is a string'); // with optional message
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assert.equal(foo, 'bar', 'foo equal `bar`');
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assert.lengthOf(foo, 3, 'foo`s value has a length of 3');
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assert.lengthOf(beverages.tea, 3, 'beverages has 3 types of tea');
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```
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### 更多信息：
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* `help chai assert`
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* `help chai expectations`
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