---
id: 587d824d367417b2b2512c50
title: Test if a Value is an Array
challengeType: 2
forumTopicId: 301600
dashedName: test-if-a-value-is-an-array
---

# --description--

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/).

# --instructions--

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.

# --hints--

All tests should pass.

```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);
    }
  );
```

You should choose the correct method for the first assertion - `isArray` vs. `isNotArray`.

```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);
    }
  );
```

You should choose the correct method for the second assertion - `isArray` vs. `isNotArray`.

```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);
    }
  );
```

# --solutions--

```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.
*/
```