---
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](https://repl.it/github/freeCodeCamp/boilerplate-mochachai), or cloned from [GitHub](https://github.com/freeCodeCamp/boilerplate-mochachai/).

`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](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer) challenge.

# --instructions--

Within `tests/1_unit-tests.js` under the test labelled `#3` in the `Basic Assertions` suite, change each `assert` to either `assert.isOk()` or `assert.isNotOk()` 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=2').then(
    (data) => {
      assert.equal(data.state, 'passed');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );
```

You should choose the correct method for the first assertion - `isOk` vs. `isNotOk`.

```js
(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);
    }
  );
```

You should choose the correct method for the second assertion - `isOk` vs. `isNotOk`.

```js
(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);
    }
  );
```

You should choose the correct method for the third assertion - `isOk` vs. `isNotOk`.

```js
(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);
    }
  );
```

# --seed--

# --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.
*/
```