37 lines
992 B
Markdown
37 lines
992 B
Markdown
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---
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title: Testing with Chaijs
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---
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<a href='http://chaijs.com' target='_blank' rel='nofollow'>Chai</a> is a testing library for Node.js.
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### Installation
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You can install Chai in your project through npm.
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```
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npm install chai
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```
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##### Pro-tip
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Add Chai in devDependencies of _package.json_, using * as version tag. In this way, you always have the most recent version.
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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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### How to use
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#### Assert
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You can use _assert_ to check if your tests are performing well.
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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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### More info:
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* `help chai assert`
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* `help chai expectations`
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