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---
id: 587d824b367417b2b2512c47
title: Test if a Variable or Function is Defined
challengeType: 2
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videoUrl: ''
localeTitle: Probar si una variable o función está definida
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---
## Description
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< section id = "description" > Como recordatorio, este proyecto se está construyendo sobre el siguiente proyecto de inicio en < a href = "https://glitch.com/#!/import/github/freeCodeCamp/boilerplate-mochachai/" > Glitch< / a > , o clonado desde < a href = "https://github.com/freeCodeCamp/boilerplate-mochachai/" > GitHub< / a > . Use assert.isDefined () o assert.isUndefined () para hacer pasar las pruebas < / section >
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## Instructions
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< section id = "instructions" >
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< / section >
## Tests
< section id = 'tests' >
```yml
tests:
- text: Todas las pruebas deben pasar
testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit& n=1").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
- text: Elija la aserción correcta - isDefined vs. isUndefined
testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit& n=1").then(data => { assert.equal(data.assertions[0].method, "isDefined", "Null is not undefined"); }, xhr => { throw new Error(xhr.responseText); })'
- text: Elija la aserción correcta - isDefined vs. isUndefined
testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit& n=1").then(data => { assert.equal(data.assertions[1].method, "isUndefined", "Undefined is undefined"); }, xhr => { throw new Error(xhr.responseText); })'
- text: Elija la aserción correcta - isDefined vs. isUndefined
testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit& n=1").then(data => { assert.equal(data.assertions[2].method, "isDefined", "A string is not undefined"); }, xhr => { throw new Error(xhr.responseText); })'
```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< / section >
## Solution
< section id = 'solution' >
```js
// solution required
```
< / section >