55 lines
2.2 KiB
Markdown
55 lines
2.2 KiB
Markdown
---
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id: 587d824c367417b2b2512c4f
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challengeType: 2
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forumTopicId: 301598
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title: 测试某个值是否在特定范围内
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---
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## Description
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<section id='description'>
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请注意，本项目在 <a href="https://repl.it/github/freeCodeCamp/boilerplate-mochachai">这个 Repl.it 项目</a> 的基础上进行开发。你也可以从 <a href='https://repl.it/github/freeCodeCamp/boilerplate-mochachai'>GitHub</a> 上克隆。
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<code>.approximately(actual, expected, delta, [message])</code>
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断言待测试的值处于 <code>expected</code> +/- <code>delta</code> 的范围内。
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</section>
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## Instructions
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<section id='instructions'>
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使用 <code>assert.approximately()</code> 让测试通过。
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选择最小范围（第三个参数）来通过所有测试。它应该小于 1。
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 不应有未通过的测试
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testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
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- text: 你应使用 approximately(actual, expected, range) 并选择正确的范围
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testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(data => { assert.equal(data.assertions[0].method, 'approximately'); assert.equal(data.assertions[0].args[2], 0.5, 'weirdNumbers(0.5) is in the range (0.5, 1.5]. It\'s within 1 +/- 0.5'); }, xhr => { throw new Error(xhr.responseText); })
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- text: 你应使用 approximately(actual, expected, range) 并选择正确的范围
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testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(data => { assert.equal(data.assertions[1].method, 'approximately'); assert.equal(data.assertions[1].args[2], 0.8, 'weirdNumbers(0.2) is in the range (0.2, 1.2]. It\'s within 1 +/- 0.8'); }, xhr => { throw new Error(xhr.responseText); })
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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</section>
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## Solution
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<section id='solution'>
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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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</section>
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