---
id: 587d824b367417b2b2512c48
title: Use Assert.isOK and Assert.isNotOK
challengeType: 2
forumTopicId: 301607
---
## Description
As a reminder, this project is being built upon the following starter project on Repl.it, or cloned from GitHub.
isOk() will test for a truthy value and isNotOk() will test for a falsy value.
To learn more about truthy and falsy values, try our Falsy Bouncer challenge.
## Instructions
Use assert.isOk() or assert.isNotOk() to make the tests pass.
## Tests
```yml
tests:
- text: All tests should pass.
testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
- text: You should choose the right assertion - isOk vs. isNotOk.
testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => { assert.equal(data.assertions[0].method, 'isNotOk', 'Null is falsy'); }, xhr => { throw new Error(xhr.responseText); })
- text: You should choose the right assertion - isOk vs. isNotOk.
testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => { assert.equal(data.assertions[1].method, 'isOk','A string is truthy'); }, xhr => { throw new Error(xhr.responseText); })
- text: You should choose the right assertion - isOk vs. isNotOk.
testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => { assert.equal(data.assertions[2].method, 'isOk', 'true is truthy'); }, xhr => { throw new Error(xhr.responseText); })
```
## Challenge Seed
## Solution
```js
/**
Backend challenges don't need solutions,
because they would need to be tested against a full working project.
Please check our contributing guidelines to learn more.
*/
```