88 lines
2.3 KiB
Markdown
88 lines
2.3 KiB
Markdown
---
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id: 587d824c367417b2b2512c4f
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title: Test if a Value Falls within a Specific Range
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challengeType: 2
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forumTopicId: 301598
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dashedName: test-if-a-value-falls-within-a-specific-range
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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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```javascript
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.approximately(actual, expected, delta, [message])
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```
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Asserts that the `actual` is equal to `expected`, to within a +/- `delta` range.
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# --instructions--
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Within `tests/1_unit-tests.js` under the test labelled `#10` in the `Comparisons` suite, change each `assert` to `assert.approximately` to make the test pass (should evaluate to `true`).
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Choose the minimum range (3rd parameter) to make the test always pass. It should be less than 1.
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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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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct range for the first assertion - `approximately(actual, expected, range)`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(
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(data) => {
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assert.equal(data.assertions[0].method, 'approximately');
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assert.equal(
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data.assertions[0].args[2],
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0.5,
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"weirdNumbers(0.5) is in the range (0.5, 1.5]. It's within 1 +/- 0.5"
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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 range for the second assertion - `approximately(actual, expected, range)`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(
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(data) => {
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assert.equal(data.assertions[1].method, 'approximately');
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assert.equal(
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data.assertions[1].args[2],
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0.8,
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"weirdNumbers(0.2) is in the range (0.2, 1.2]. It's within 1 +/- 0.8"
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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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# --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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