freeCodeCamp/curriculum/challenges/english/06-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.md

---
id: 587d824d367417b2b2512c53
title: Test if a String Contains a Substring
challengeType: 2
forumTopicId: 301597
---

## Description

<section id='description'>

As a reminder, this project is being built upon the following starter project on <a href="https://repl.it/github/freeCodeCamp/boilerplate-mochachai">Repl.it</a>, or cloned from <a href='https://github.com/freeCodeCamp/boilerplate-mochachai/'>GitHub</a>.

`include()` and `notInclude()` work for strings too!
`include()` asserts that the actual string contains the expected substring.

</section>

## Instructions

<section id='instructions'>

Within `tests/1_unit-tests.js` under the test labelled `#14` in the `Strings` suite, change each `assert` to either `assert.include` or `assert.notInclude` to make the test pass (should evaluate to `true`). Do not alter the arguments passed to the asserts.

</section>

## Tests

<section id='tests'>

```yml
tests:
  - text: All tests should pass.
    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=13').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
  - text: You should choose the correct method for the first assertion - `include` vs. `notInclude`.
    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=13').then(data => {  assert.equal(data.assertions[0].method, 'include', '\'Arrow\' contains \'row\'...'); }, xhr => { throw new Error(xhr.responseText); })
  - text: You should choose the correct method for the second assertion - `include` vs. `notInclude`.
    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=13').then(data => {  assert.equal(data.assertions[1].method, 'notInclude', '... a \'dart\' doesn\'t contain a \'queue\''); }, xhr => { throw new Error(xhr.responseText); })
```

</section>

## Challenge Seed

<section id='challengeSeed'>

</section>

## Solution

<section id='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.
*/
```

</section>