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---
id: 587d824a367417b2b2512c46
title: Learn How JavaScript Assertions Work
challengeType: 2
---
## Description
< section id = 'description' >
As a reminder, this project is being built upon the following starter project on < a href = 'https://glitch.com/#!/import/github/freeCodeCamp/boilerplate-mochachai/' > Glitch< / a > , or cloned from < a href = 'https://github.com/freeCodeCamp/boilerplate-mochachai/' > GitHub< / a > .
Use assert.isNull() or assert.isNotNull() to make the tests pass.
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## Instructions
< section id = 'instructions' >
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## Tests
< section id = 'tests' >
```yml
tests:
- text: All tests should pass
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testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit& n=0').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
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- text: Choose the right assertion - isNull vs. isNotNull
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testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit& n=0').then(data => { assert.equal(data.assertions[0].method, 'isNull', 'Null is null'); }, xhr => { throw new Error(xhr.responseText); })
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- text: Choose the right assertion - isNull vs. isNotNull
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testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit& n=0').then(data => { assert.equal(data.assertions[1].method, 'isNotNull', '1 is not null'); }, xhr => { throw new Error(xhr.responseText); })
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```
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## Challenge Seed
< section id = 'challengeSeed' >
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## Solution
< section id = 'solution' >
```js
// solution required
```
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