freeCodeCamp/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
587d824c367417b2b2512c4f	测试某个值是否在特定范围内	2	301598	test-if-a-value-falls-within-a-specific-range

--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。

.approximately(actual, expected, delta, [message]) 断言待测试的值处于 expected +/- delta 的范围内。

--instructions--

使用 assert.approximately() 让测试通过。

选择最小范围（第三个参数）来通过所有测试。它应该小于 1。

--hints--

不应有未通过的测试

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(
    (data) => {
      assert.equal(data.state, 'passed');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

你应使用 approximately(actual, expected, range) 并选择正确的范围

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(
    (data) => {
      assert.equal(data.assertions[0].method, 'approximately');
      assert.equal(
        data.assertions[0].args[2],
        0.5,
        "weirdNumbers(0.5) is in the range (0.5, 1.5]. It's within 1 +/- 0.5"
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

你应使用 approximately(actual, expected, range) 并选择正确的范围

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(
    (data) => {
      assert.equal(data.assertions[1].method, 'approximately');
      assert.equal(
        data.assertions[1].args[2],
        0.8,
        "weirdNumbers(0.2) is in the range (0.2, 1.2]. It's within 1 +/- 0.8"
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

--solutions--

/**
  Backend challenges don't need solutions, 
  because they would need to be tested against a full working project. 
  Please check our contributing guidelines to learn more.
*/