freeCodeCamp/guide/spanish/miscellaneous/chaijs-cheatsheet/index.md

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---
title: Chaijs Cheatsheet
localeTitle: Chaijs Cheatsheet
---
## Afirmar
```
assert(val)
assert.fail(actual, expected)
assert.ok(val) // is truthy
assert.equal(actual, expected) // 'compare with =='
assert.strictEqual
assert.deepEqual
assert.isTrue
assert.isFalse
assert.isNull
assert.isNotNull
assert.isUndefined
assert.isDefined
assert.isFunction
assert.isObject
assert.isArray
assert.isString
assert.isNumber
assert.isBoolean
assert.typeOf(/tea/, 'regexp') // Object.prototype.toString()
assert.instanceOf(chai, Tea)
assert.include(<a href='https://github.com/rstacruz/cheatsheets' target='_blank' rel='nofollow'> a,b,c ], a)
assert.match(val, /regexp/)
assert.property(obj, 'tea') // 'tea' in object
assert.deepProperty(obj, 'tea.green')
assert.propertyVal(person, 'name', 'John')
assert.deepPropertyVal(post, 'author.name', 'John')
assert.lengthOf(object, 3)
assert.throws(function() { ... })
assert.throws(function() { ... }, /reference error/)
assert.doesNotThrow
assert.operator(1, '<', 2)
assert.closeTo(actual, expected)
```
## Debe: cadenas
```
.to .be .been .is .that .and .have .with .at .of .same
```
## No debería
```
expect(object).not.equal('x')
```
## Esperanzas de heredar
```
expect(object)
.equal(expected)
.eql
.deep.equal(expected) // same as .eql
.be.a('string')
.include(val)
.be.ok(val)
.be.true
.be.false
.be.null
.be.undefined
.be.empty
.be.arguments
.be.function
.be.instanceOf
.gt(5) # or .above .greaterThan
.gte # or .at.least
.lt(5) # or .below
.respondTo('bar')
.satisfy (n) -> n > 0
.have.members([2, 3, 4])
.have.keys(['foo'])
.have.key('foo')
.exist
expect(-> ...)
.throw /not a function/
```
## Chai-jQuery
```
global.jQuery = ...;
chai.use(require('chai-jquery'));
expect($body)
.have.attr('foo')
.have.prop('disabled')
.have.css('background')
.have.css('background-color', '#ffffff')
.have.data('foo')
.have.class('active')
.have.id('id')
.have.html('<em>hi</em>')
.have.text('hello')
.have.value('2013')
.be.visible
.be.hidden
.be.checked
.be.selected
.be.enabled
.be.disabled
.be.empty
.to.exist
.to.contain('text')
.to.have('.selector')
```
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