--- 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. */ ```