freeCodeCamp/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.md

id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
587d824a367417b2b2512c46	了解 JavaScript 断言是如何使用的	2	301589

--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.isNull() 或 assert.isNotNull() 来让测试通过。

--hints--

不应有未通过的测试

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(
    (data) => {
      assert.equal(data.state, 'passed');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

请选择正确的断言—isNull 或 isNotNull

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(
    (data) => {
      assert.equal(data.assertions[0].method, 'isNull', 'Null is null');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

You should choose the right assertion - isNull vs. isNotNull.

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(
    (data) => {
      assert.equal(data.assertions[1].method, 'isNotNull', '1 is not null');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

--solutions--