freeCodeCamp/curriculum/challenges/chinese-traditional/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	測試某個值是否在特定範圍內	2	301598	test-if-a-value-falls-within-a-specific-range

--description--

請注意，本項目在這個 Replit 項目的基礎上進行開發。你也可以從 GitHub 上克隆。

.approximately(actual, expected, delta, [message])

斷言 actual 等於 expected，在 +/- delta 的範圍內。

--instructions--

在 tests/1_unit-tests.js 中，在 Comparisons 套件裏標有 #10 的測試中，將每個 assert 改成 assert.approximately，讓測試通過（結果應該返回 true）。

選擇最小範圍（第三個參數）來通過所有測試。 它應該小於 1。

--hints--

不應有未通過的測試

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

應該爲第一個斷言選擇正確的範圍——approximately(actual, expected, range)。

(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);
    }
  );

應該爲第二個斷言選擇正確的範圍——approximately(actual, expected, range)。

(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--

/**
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  Please check our contributing guidelines to learn more.
*/