freeCodeCamp/curriculum/challenges/chinese-traditional/06-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
587d824e367417b2b2512c57	測試對象是否是構造函數的實例	2	301605	test-if-an-object-is-an-instance-of-a-constructor

--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。

#instanceOf 斷言一個對象是一個構造器的實例。

--instructions--

在 tests/1_unit-tests.js 中，Objects 套件裏標有 #18 的測試下，將每個 assert 改成 assert.instanceOf 或 assert.notInstanceOf 方法，通過測試（結果應該返回 true）。 不要修改傳給斷言的參數。

--hints--

應通過所有測試。

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').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方法：instanceOf 或 notInstanceOf。

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
    (data) => {
      assert.equal(
        data.assertions[0].method,
        'notInstanceOf',
        'myCar is not an instance of Plane'
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

應該爲第二個斷言選擇正確的方法：instanceOf 或 notInstanceOf。

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
    (data) => {
      assert.equal(
        data.assertions[1].method,
        'instanceOf',
        'airlinePlane is an instance of Plane'
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

應該爲第三個斷言選擇正確的方法：instanceOf 或 notInstanceOf。

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
    (data) => {
      assert.equal(
        data.assertions[2].method,
        'instanceOf',
        'everything is an Object in JavaScript...'
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

應該爲第四個斷言選擇正確的方法：instanceOf 或 notInstanceOf。

(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
    (data) => {
      assert.equal(
        data.assertions[3].method,
        'notInstanceOf',
        'myCar.wheels is not an instance of String'
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );

--solutions--

/**
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  because they would need to be tested against a full working project. 
  Please check our contributing guidelines to learn more.
*/