2018-10-10 22:03:03 +00:00
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---
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id: 587d824b367417b2b2512c49
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2021-03-22 13:52:28 +00:00
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title: 测试真实性
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2018-10-10 22:03:03 +00:00
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challengeType: 2
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2021-02-06 04:42:36 +00:00
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forumTopicId: 301596
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2021-01-13 02:31:00 +00:00
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dashedName: test-for-truthiness
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2021-05-12 15:55:58 +00:00
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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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2020-09-17 10:50:23 +00:00
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2021-03-22 13:52:28 +00:00
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`isTrue()` 仅当给出的值为 Boolean 的 `true` 时可以通过测试;`isNotTrue()` 则会在给出除 `true` 以外的值时通过测试。
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2020-09-17 10:50:23 +00:00
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```js
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2021-08-20 07:00:51 +00:00
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assert.isTrue(true, 'This will pass with the boolean value true');
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assert.isTrue('true', 'This will NOT pass with the string value "true"');
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assert.isTrue(1, 'This will NOT pass with the number value 1');
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2020-09-17 10:50:23 +00:00
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```
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2021-03-22 13:52:28 +00:00
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`isFalse()` 和 `isNotFalse()` 同样存在,与上面提到的两个方法类似,只不过它们针对值为 `false` 的布尔值。
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2020-09-17 10:50:23 +00:00
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2020-12-16 07:37:30 +00:00
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# --instructions--
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2018-10-10 22:03:03 +00:00
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2021-03-22 13:52:28 +00:00
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在 `tests/1_unit-tests.js` 中,`Basic Assertions` 套件中标注为 `#4` 的测试下,修改每个 `assert` 为 `assert.isTrue` 或 `assert.isNotTrue`,通过测试(结果应为 `true`)。 不要修改传入断言的参数。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2021-03-22 13:52:28 +00:00
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应通过所有测试。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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2018-10-10 22:03:03 +00:00
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```
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2021-03-22 13:52:28 +00:00
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应该为第一个断言选择正确的方法:`isTrue` 或 `isNotTrue`。
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2020-12-16 07:37:30 +00:00
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(
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(data) => {
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assert.equal(data.assertions[0].method, 'isTrue', 'True is true');
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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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2018-10-10 22:03:03 +00:00
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2021-03-22 13:52:28 +00:00
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应该为第二个断言选择正确的方法:`isTrue` 或 `isNotTrue`。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(
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(data) => {
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assert.equal(
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data.assertions[1].method,
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'isTrue',
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'Double negation of a truthy value is true'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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2018-10-10 22:03:03 +00:00
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2021-03-22 13:52:28 +00:00
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应该为第三个断言选择正确的方法:`isTrue` 或 `isNotTrue`。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(
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(data) => {
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assert.equal(
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data.assertions[2].method,
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'isNotTrue',
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'A truthy object is not true - neither is a false one'
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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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2018-10-10 22:03:03 +00:00
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```
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2020-08-13 15:24:35 +00:00
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2021-01-13 02:31:00 +00:00
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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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