freeCodeCamp/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.chinese.md

id, title, challengeType, forumTopicId, localeTitle

id	title	challengeType	forumTopicId	localeTitle
587d824b367417b2b2512c47	Test if a Variable or Function is Defined	2	301602	测试变量或函数是否已定义

Description

请注意，本项目在 这个 Repl.it 项目 的基础上进行开发。你也可以从 GitHub 上克隆。

Instructions

使用 assert.isDefined() 或 assert.isUndefined() 让测试通过。

Tests

tests:
  - text: 不应有未通过的测试
    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
  - text: 请选择正确的断言—idDefined 或 idUndefined
    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {  assert.equal(data.assertions[0].method, 'isDefined', 'Null is not undefined'); }, xhr => { throw new Error(xhr.responseText); })
  - text: 请选择正确的断言—idDefined 或 idUndefined
    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {  assert.equal(data.assertions[1].method, 'isUndefined', 'Undefined is undefined'); }, xhr => { throw new Error(xhr.responseText); })
  - text: 请选择正确的断言—idDefined 或 idUndefined
    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {  assert.equal(data.assertions[2].method, 'isDefined', 'A string is not undefined'); }, xhr => { throw new Error(xhr.responseText); })

Challenge Seed

Solution

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