94 lines
2.3 KiB
Markdown
94 lines
2.3 KiB
Markdown
---
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id: 587d824e367417b2b2512c55
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title: 测试对象是否具有某个属性
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challengeType: 2
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forumTopicId: 301604
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dashedName: test-if-an-object-has-a-property
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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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`property` 断言一个对象含有给定属性。
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# --instructions--
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在 `tests/1_unit-tests.js` 中，`Objects` 套件里标有 `#16` 的测试下，将每个 `assert` 改成 `assert.property` 或 `assert.notProperty` 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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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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应该为第一个断言选择正确的方法：`property` 或 `notProperty`。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(
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(data) => {
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assert.equal(
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data.assertions[0].method,
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'notProperty',
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'A car has not wings'
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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：`property` 或 `notProperty`。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(
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(data) => {
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assert.equal(
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data.assertions[1].method,
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'property',
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'planes have engines'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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应该为第三个断言选择正确的方法：`property` 或 `notProperty`。
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(
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(data) => {
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assert.equal(data.assertions[2].method, 'property', 'Cars have wheels');
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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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