97 lines
2.3 KiB
Markdown
97 lines
2.3 KiB
Markdown
---
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id: 587d824b367417b2b2512c47
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title: Test if a Variable or Function is Defined
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challengeType: 2
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forumTopicId: 301602
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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 [Repl.it](https://repl.it/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 `#2` in the `Basic Assertions` suite, change each `assert` to either `assert.isDefined()` or `assert.isUndefined()` 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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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the first assertion - `isDefined` vs. `isUndefined`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(
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(data) => {
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assert.equal(
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data.assertions[0].method,
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'isDefined',
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'Null is not undefined'
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);
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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 - `isDefined` vs. `isUndefined`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(
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(data) => {
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assert.equal(
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data.assertions[1].method,
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'isUndefined',
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'Undefined is undefined'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the third assertion - `isDefined` vs. `isUndefined`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(
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(data) => {
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assert.equal(
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data.assertions[2].method,
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'isDefined',
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'A string is not undefined'
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);
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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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# --seed--
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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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