Salesforce CRT-450 Questions Answers

Creating a test class to execute the business logic and run the test in the Developer Console is the best approach to ensure that the Apex class is working according to specification. Test classes are used to verify the functionality, performance, and security of the Apex code, and to provide code coverage for deployment. Test classes can also use assertions to validate the expected outcomes of the code. The Developer Console provides a user interface to create, run, and debug test classes, and to view the test results and code coverage1.

Including a savepoint and Database.rollback is not a valid approach to test the Apex class, as it is used to undo the changes made by the DML operations in a transaction2. This does not verify the functionality or performance of the Apex code, nor does it provide code coverage.

Including a try/catch block to the Apex class is not a sufficient approach to test the Apex class, as it is used to handle the exceptions that may occur during the execution of the code3. This does not verify the functionality or performance of the Apex code, nor does it provide code coverage. Moreover, a try/catch block should be used in conjunction with a test class, not as a replacement.

Running the code in an Execute Anonymous block in the Developer Console is not a recommended approach to test the Apex class, as it is used to execute arbitrary Apex code that is not saved as part of the application. This does not verify the functionality or performance of the Apex code, nor does it provide code coverage. Moreover, running the code in an Execute Anonymous block may have unintended consequences on the data and the application, as it does not follow the best practices of testing.

References:

• 1: Test Classes | Apex Developer Guide | Salesforce Developers
• 2: Savepoints and Rollbacks | Apex Developer Guide | Salesforce Developers
• 3: Exception Handling | Apex Developer Guide | Salesforce Developers
• : [Execute Anonymous | Apex Developer Guide | Salesforce Developers]
• : [Best Practices for Testing | Apex Developer Guide | Salesforce Developers]

 To create a CreditcardPayment class that provides an implementation of an existing Payment class, the developer should use the extends keyword to indicate that CreditcardPayment is a subclass of Payment, and the override keyword to indicate that CreditcardPayment provides a different implementation of the makePayment method than the superclass. This way, the CreditcardPayment class inherits the properties and methods of the Payment class, but can also modify or add its own behavior.

The other options are not correct because:

• B. Public class CreditCardPayment implements Payment. This option is not valid, because the implements keyword is used to indicate that a class implements an interface, not another class. An interface is a collection of abstract methods that a class must define, but a class is a blueprint for creating objects that have properties and methods.
• C. Public class CreditCardPayment extends Payment. This option is not valid, because it does not use the override keyword to provide a different implementation of the makePayment method. Without the override keyword, the subclass would inherit the same implementation of the method as the superclass, which defeats the purpose of creating a subclass.
• D. Public class CreditCardPayment implements Payment. This option is not valid, because it has the same problem as option B. It uses the implements keyword instead of the extends keyword, which is incorrect for creating a subclass of another class.

References:

• : Inheritance
• : Interfaces

The first step towards troubleshooting the issue is to check the asynchronous job monitoring page to view the job status and logs. This page shows the progress, state, and results of the batch Apex job, as well as any errors or exceptions that occurred during the execution. The developer can use this information to identify the cause of the timeout and take appropriate actions to fix it. References: Using Batch Apex, Use Batch Apex Unit, Execute a batch Apex from Developer Console

Declarative development is the process of configuring and customizing the Salesforce platform using its built-in tools, such as the setup menu, without writing any code. Declarative development has the following advantages over programmatic customization, which involves writing custom code using Apex, Visualforce, or other languages:

• Declarative development can be done by anyone who knows how to use the Salesforce user interface, without requiring any programming knowledge or skills. Programmatic customization requires a skilled developer who knows how to write, test, and debug code.
• Declarative development does not require Apex test classes, which are mandatory for deploying any custom code to production. Apex test classes are used to verify the functionality and quality of the code, and to ensure that it meets the code coverage requirement of at least 75%. Declarative development does not have this requirement, as the platform automatically validates the configuration and customization.
• Declarative development is faster and easier to implement, as it involves clicking and dragging components, setting properties, and defining rules. Programmatic customization is more time-consuming and complex, as it involves writing lines of code, using development tools, and following coding standards and best practices.

However, declarative development also has some limitations and disadvantages compared to programmatic customization, such as:

• Declarative development has lower design limits and query limits than programmatic customization. Design limits are the maximum number of components, fields, objects, rules, etc. that can be used in a Salesforce org. Query limits are the maximum number of records that can be retrieved or manipulated in a single transaction. Programmatic customization can bypass some of these limits by using techniques such as dynamic SOQL, batch Apex, or asynchronous Apex.
• Declarative development has less flexibility and control over the functionality and user interface than programmatic customization. Programmatic customization can create custom logic, automation, integration, and user interface that are not possible or supported by the declarative tools. For example, programmatic customization can use Apex triggers to execute logic before or after a record is inserted, updated, deleted, or undeleted, while declarative development can only use workflow rules or process builder to execute logic after a record is created or updated.
• Declarative development can become difficult to maintain and troubleshoot as the complexity and number of components, rules, and dependencies increase. Programmatic customization can be more organized and modular, as it can use classes, methods, variables, comments, and annotations to structure and document the code.

Therefore, the best practice is to use a combination of declarative and programmatic development, depending on the use case and the requirements. The general rule of thumb is to use declarative development whenever possible, and use programmatic customization only when necessary or when it provides significant benefits.

References:

• Programmatic vs Declarative: Are Clicks Better Than Code?
• Clicks Not Code: Benefits of Declarative Vs. Imperative Programming
• Review Developer Fundamentals Unit