37 lines
992 B
Markdown
37 lines
992 B
Markdown
---
|
|
title: Testing with Chaijs
|
|
---
|
|
<a href='http://chaijs.com' target='_blank' rel='nofollow'>Chai</a> is a testing library for Node.js.
|
|
|
|
### Installation
|
|
You can install Chai in your project through npm.
|
|
```
|
|
npm install chai
|
|
```
|
|
##### Pro-tip
|
|
Add Chai in devDependencies of _package.json_, using * as version tag. In this way, you always have the most recent version.
|
|
```
|
|
"devDependencies": {
|
|
"chai": "*"
|
|
}
|
|
```
|
|
|
|
### How to use
|
|
|
|
#### Assert
|
|
You can use _assert_ to check if your tests are performing well.
|
|
```
|
|
var assert = require('chai').assert, foo = 'bar', beverages = { tea: [ 'chai', 'matcha', 'oolong' ] };
|
|
|
|
assert.typeOf(foo, 'string'); // without optional message
|
|
assert.typeOf(foo, 'string', 'foo is a string'); // with optional message
|
|
assert.equal(foo, 'bar', 'foo equal `bar`');
|
|
assert.lengthOf(foo, 3, 'foo`s value has a length of 3');
|
|
assert.lengthOf(beverages.tea, 3, 'beverages has 3 types of tea');
|
|
```
|
|
|
|
### More info:
|
|
|
|
* `help chai assert`
|
|
* `help chai expectations`
|