freeCodeCamp/curriculum/challenges/chinese-traditional/06-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.md

---
id: 587d824e367417b2b2512c55
title: 測試對象是否具有某個屬性
challengeType: 2
forumTopicId: 301604
dashedName: test-if-an-object-has-a-property
---

# --description--

請注意，本項目在[這個 Replit 項目](https://replit.com/github/freeCodeCamp/boilerplate-mochachai)的基礎上進行開發。你也可以從 [GitHub](https://repl.it/github/freeCodeCamp/boilerplate-mochachai) 上克隆。

`property` 斷言一個對象含有給定屬性。

# --instructions--

在 `tests/1_unit-tests.js` 中，`Objects` 套件裏標有 `#16` 的測試下，將每個 `assert` 改成 `assert.property` 或 `assert.notProperty` 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。

```js
(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').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：`property` 或 `notProperty`。

```js
(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(
    (data) => {
      assert.equal(
        data.assertions[0].method,
        'notProperty',
        'A car has not wings'
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );
```

應該爲第二個斷言選擇正確的方法：`property` 或 `notProperty`。

```js
(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(
    (data) => {
      assert.equal(
        data.assertions[1].method,
        'property',
        'planes have engines'
      );
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );
```

應該爲第三個斷言選擇正確的方法：`property` 或 `notProperty`。

```js
(getUserInput) =>
  $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(
    (data) => {
      assert.equal(data.assertions[2].method, 'property', 'Cars have wheels');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );
```

# --solutions--

```js
/**
  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.
*/
```