88 lines
2.3 KiB
Markdown
88 lines
2.3 KiB
Markdown
---
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id: 587d824c367417b2b2512c4f
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title: 测试某个值是否在特定范围内
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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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请注意，本项目在 [这个 Repl.it 项目](https://repl.it/github/freeCodeCamp/boilerplate-mochachai) 的基础上进行开发。 你也可以从 [GitHub](https://repl.it/github/freeCodeCamp/boilerplate-mochachai) 上克隆。
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```javascript
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.approximately(actual, expected, delta, [message])
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```
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断言 `actual` 等于 `expected`，在 +/- `delta` 的范围内。
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# --instructions--
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在 `tests/1_unit-tests.js` 中，在 `Comparisons` 套件里标有 `#10` 的测试中，将每个 `assert` 改成 `assert.approximately`，让测试通过（结果应该返回 `true`）。
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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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# --hints--
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不应有未通过的测试
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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应该为第一个断言选择正确的范围——`approximately(actual, expected, range)`。
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```js
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(getUserInput) =>
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$.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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应该为第二个断言选择正确的范围——`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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