Developers CRT-450 Passing Score

To check the code coverage of a class after running all tests, the developer should view the code coverage percentage for the class using the Overall Code Coverage panel in the Developer Console Tests tab. This panel shows the code coverage for each class and trigger in the org, as well as the overall code coverage percentage. The developer can also double-click on a class or trigger name to see the code coverage details, such as which lines are covered or not covered by tests.

The other options are not correct because:

• A. View the Code Coverage column in the list view on the Apex Classes page. This option only shows the code coverage percentage for each class, but not the details of which lines are covered or not covered by tests. It also does not show the code coverage for triggers or the overall code coverage percentage.
• B. View the Class Test Percentage tab on the Apex Class fist view m Salesforce Setup. This option does not exist in Salesforce Setup. There is no such tab or view for Apex classes.
• D. Select and run the class on the Apex Test Execution page in the Developer Console. This option only runs the test methods in the selected class, but does not show the code coverage for the class or other classes and triggers in the org.

References:

• : Testing and Code Coverage
• : Developer Console

 To use a custom exception, you can create an instance of the custom exception class and use the throw keyword to throw the exception. You can also optionally provide a custom error message or a chained exception cause as arguments to the custom exception constructor. The syntax for throwing a custom exception is:

throw new CustomException(optional_message, optional_cause);

Therefore, the options B and D are valid ways to fire the custom exception in Apex. The options A and C are invalid because they only create an instance of the custom exception class, but do not throw it. Also, the option C uses single quotes instead of double quotes for the error message, which is not allowed in Apex. References: You can find more information about custom exceptions in the Apex Developer Guide and the Apex Reference Guide on Salesforce’s official website. You can also read this blog post for a tutorial on creating and using custom exceptions.

 A trigger is a piece of Apex code that executes before or after certain events, such as insert, update, delete, or undelete1. An aggregate function is a function that performs a calculation on a set of values and returns a single value, such as SUM, COUNT, AVG, MIN, or MAX2. A roll-up summary field is a field that calculates values from related records, such as those in a related list3. However, roll-up summary fields are only available for master-detail relationships, not for lookup relationships3. Therefore, to achieve a similar functionality for a custom object that is not in a master-detail relationship with the Opportunity object, a trigger can be written on the child object that uses an aggregate function to sum the amount for all related child objects under the Opportunity object. The trigger should handle different scenarios, such as insert, update, delete, or undelete of the child records, and update the corresponding Opportunity record accordingly. References:

• Triggers | Apex Developer Guide | Salesforce Developers
• Aggregate Functions | SOQL and SOSL Reference | Salesforce Developers
• Roll-Up Summary Field | Salesforce Help
• [Custom Roll-up Summary on Account Object | Salesforce Developer Guide - SFDCian]

 Developer Edition orgs are free, fully-featured copies of Salesforce that are designed for developers to create and test applications. They have the same configuration as the production org, but with limited data and file storage. Developer Edition orgs are ideal for individual developers or small teams who want to work in their own orgs that are isolated from each other. Full Sandbox orgs are also copies of the production org, but they require a paid license and have a refresh interval of 29 days. Partner Developer Edition orgs are similar to Developer Edition orgs, but they have higher limits on data and file storage, as well as the number of custom objects and tabs. They are available only to Salesforce partners who are enrolled in the Partner Program. Developer Sandbox orgs are copies of the production org metadata, but they have very limited data and file storage, and a refresh interval of one day. They are useful for coding and testing in a disposable environment, but not for developing complex applications that require more resources. References:

• Certification - Platform Developer I - Trailhead
• SALESFORCE CERTIFIED PLATFORM DEVELOPER I
• [Developer Edition Orgs | Salesforce Trailhead]
• [Sandbox Types and Templates | Salesforce Trailhead]