76 lines
2.2 KiB
Markdown
76 lines
2.2 KiB
Markdown
---
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id: 587d824a367417b2b2512c46
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title: Learn How JavaScript Assertions Work
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challengeType: 2
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forumTopicId: 301589
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dashedName: learn-how-javascript-assertions-work
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---
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# --description--
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Working on these challenges will involve you writing your code using one of the following methods:
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- Clone [this GitHub repo](https://github.com/freeCodeCamp/boilerplate-mochachai/) and complete these challenges locally.
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- Use [our Repl.it starter project](https://repl.it/github/freeCodeCamp/boilerplate-mochachai) to complete these challenges.
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- Use a site builder of your choice to complete the project. Be sure to incorporate all the files from our GitHub repo.
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When you are done, make sure a working demo of your project is hosted somewhere public. Then submit the URL to it in the `Solution Link` field.
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# --instructions--
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Within `tests/1_unit-tests.js` under the test labelled `#1` in the `Basic Assertions` suite, change each `assert` to either `assert.isNull` or `assert.isNotNull` 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
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the first assertion - `isNull` vs. `isNotNull`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(
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(data) => {
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assert.equal(data.assertions[0].method, 'isNull', 'Null is null');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the second assertion - `isNull` vs. `isNotNull`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(
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(data) => {
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assert.equal(data.assertions[1].method, 'isNotNull', '1 is not null');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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# --solutions--
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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