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| Section | Objectives |
|---|---|
| Topic 1: Integration and Security | - Security implementation
|
| Topic 2: Testing, Debugging, and Deployment | - Deployment practices
|
| Topic 3: Advanced Apex Programming and Data Modeling | - Advanced Apex concepts
|
| Topic 4: User Interface Development | - Lightning Component Development
|
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NEW QUESTION # 147
開発者は、ユーザのチェックボックスの選択に基づいて子コンポーネントを条件付きで表示する Lightning Web コンポーネントの Jest テストを作成しています。
各シナリオで正しいコンポーネントが表示または非表示になることを適切にテストするには、開発者は何をすべきでしょうか?
Answer: B
Explanation:
The best way to properly test that the correct components display and hide for each scenario is to reset the DOM after each test with the afterEach() method. The afterEach() method is a lifecycle hook that runs after each test, and can be used to perform cleanup tasks, such as removing the elements from the DOM, resetting the mocks, or clearing the caches. This ensures that each test runs in a clean and isolated environment, and does not affect the results of other tests. Creating a new describe block for each test will not help, as the describe block is used to group related tests, but it does not reset the DOM after each test. Creating a teardown block to reset the DOM after each test will not work, as there is no such block in Jest, and the developer should use the afterEach() method instead. Creating a new jsdom instance for each test will not work, as jsdom is a JavaScript implementation of the DOM and HTML standards, and it is not a part of Jest, but a dependency that Jest uses to provide a browser-like environment. The developer should use the document object provided by Jest to manipulate the DOM, and use the afterEach() method to reset it. Reference: [Testing Lightning Web Components], [Jest Documentation]
NEW QUESTION # 148
これを修正する最適な方法は何ですか?
Answer: D
Explanation:
Test.startTest() and Test.stopTest() should wrap the method call for resource allocation. Test.setMock() sets a mock callout for the test to handle callouts.References: Apex Developer Guide - Testing HTTP Callouts
NEW QUESTION # 149
次のコードがあるとします。
今日、10 件の取引先責任者と 5 件の取引先が作成されたと仮定すると、どのような結果が予想されますか?
Answer: C
NEW QUESTION # 150
ページが連絡先に対して「null オブジェクトを逆参照しようとしました」エラーをスローします。
コントローラーのどのような変更を行うとエラーが修正されますか?
Answer: B
Explanation:
The error 'Attempt to dereference a null object' often occurs when trying to access a member of a null object.
By checking if the object is null in the getter method and returning a new instance if it is, the error can be prevented.
References:
Apex Developer Guide
NEW QUESTION # 151
Universal Containers は、Customer Community Plus ライセンスを持つ Customer Community を使用して、顧客がレンタルしたコンテナの数と返却期限を追跡できるようにしたいと考えています。Universal Containers は、外部ユーザー向けにプライベート共有モデルを使用しています。顧客の多くは、複雑なアカウント階層を持つ多国籍企業です。階層上の各取引先は、同じビジネス内の部門を表します。要件の 1 つは、取引先担当者をさまざまな取引先レコードに関連付けるカスタム ジャンクション オブジェクトに基づいて、同じ取引先階層内の特定のコミュニティ ユーザーが複数の部門のコンテナを表示できるようにすることです。部門を代表するものです。
これらの要件を解決するソリューションはどれですか?
Answer: D
NEW QUESTION # 152
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