94 lines
2.3 KiB
Markdown
94 lines
2.3 KiB
Markdown
---
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id: 587d824d367417b2b2512c52
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title: 测试某个值是否为字符串
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challengeType: 2
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forumTopicId: 301599
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dashedName: test-if-a-value-is-a-string
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---
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# --description--
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请注意，本项目在[这个 Replit 项目](https://replit.com/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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`isString` 或 `isNotString` 断言一个值是否为字符串。
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# --instructions--
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在 `tests/1_unit-tests.js` 中，`Strings` 套件里标有 `#13` 的测试下，将每个 `assert` 改成 `assert.isString` 或 `assert.isNotString` 方法，通过测试（结果应该返回 `true`）。 不要修改传给断言的参数。
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# --hints--
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应通过所有测试。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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应该为第一个断言选择正确的方法：`isString` 或 `isNotString`。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(
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(data) => {
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assert.equal(
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data.assertions[0].method,
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'isNotString',
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'A float number is not a string'
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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方法：`isString` 或 `isNotString`。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(
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(data) => {
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assert.equal(
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data.assertions[1].method,
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'isString',
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'environment vars are strings (or undefined)'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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应该为第三个断言选择正确的方法：`isString` 或 `isNotString`。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(
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(data) => {
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assert.equal(data.assertions[2].method, 'isString', 'A JSON is a string');
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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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