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---
id: 587d824d367417b2b2512c50
title: Test if a Value is an Array
challengeType: 2
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forumTopicId: 301600
2021-01-13 02:31:00 +00:00
dashedName: test-if-a-value-is-an-array
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---
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# --description--
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As a reminder, this project is being built upon the following starter project on [Replit.com ](https://replit.com/github/freeCodeCamp/boilerplate-mochachai ), or cloned from [GitHub ](https://github.com/freeCodeCamp/boilerplate-mochachai/ ).
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# --instructions--
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Within `tests/1_unit-tests.js` under the test labelled `#11` in the `Arrays` suite, change each `assert` to either `assert.isArray` or `assert.isNotArray` to make the test pass (should evaluate to `true` ). Do not alter the arguments passed to the asserts.
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# --hints--
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All tests should pass.
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```js
(getUserInput) =>
$.get(getUserInput('url') + '/_api/get-tests?type=unit& n=10').then(
(data) => {
assert.equal(data.state, 'passed');
},
(xhr) => {
throw new Error(xhr.responseText);
}
);
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```
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You should choose the correct method for the first assertion - `isArray` vs. `isNotArray` .
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```js
(getUserInput) =>
$.get(getUserInput('url') + '/_api/get-tests?type=unit& n=10').then(
(data) => {
assert.equal(
data.assertions[0].method,
'isArray',
'String.prototype.split() returns an Array'
);
},
(xhr) => {
throw new Error(xhr.responseText);
}
);
```
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You should choose the correct method for the second assertion - `isArray` vs. `isNotArray` .
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```js
(getUserInput) =>
$.get(getUserInput('url') + '/_api/get-tests?type=unit& n=10').then(
(data) => {
assert.equal(
data.assertions[1].method,
'isNotArray',
'Array.prototype.indexOf() returns a number'
);
},
(xhr) => {
throw new Error(xhr.responseText);
}
);
```
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# --solutions--
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```js
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/**
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.
*/
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```