SF-PD2 Practice Test 6 — 10 Questions

Question 1

A developer is writing a test method for a class that performs a SOQL query on a custom object. The test must ensure that the query returns the expected number of records. Which testing approach should be used to create test data that is isolated from the organization's data?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Create test records within the test method using DML operations and then run the query.. Creating test records within the test method using DML ensures that the data is isolated and rolled back after the test. This allows the developer to control the dataset and verify the query returns the expected number of records without interference from existing organizational data.

Answer

Use Test.loadData to load a static resource containing test records.

Answer

Use @isTest(SeeAllData=true) to access existing records and avoid creating test data.

Answer

Annotate the test class with @isTest and rely on the default data that Salesforce provides in test contexts.

Question 2

A developer is preparing to deploy a change set from a sandbox to production. The change set includes an Apex class that references a new custom field on Account. The deployment fails with a 'field does not exist' error. What is the most likely cause and the correct action?

Accepted Answer

The custom field was not added to the change set; the developer must add the field to the change set and redeploy.. Change sets require all dependent metadata to be included explicitly. When an Apex class references a custom field that is not in the change set, the target org lacks that field, and the deployment fails at compile time. The solution is to add the custom field to the change set and redeploy. This ensures the field exists before the class is compiled, resolving the dependency error.

Answer

The custom field is not accessible to the deploying user's profile; the developer must grant field-level security and redeploy.

Answer

The custom field's API name was changed in the sandbox; the developer must update the Apex class to use the new API name before deploying.

Answer

The Apex class was deployed before the custom field; the developer must deploy the field first, then the class.

Question 3

A developer is optimizing a Visualforce page that displays a large table of OpportunityLineItem records. The page uses a standard controller with an extension that queries all related OpportunityLineItems for an Opportunity. The page loads slowly for Opportunities with thousands of line items. The developer wants to improve performance without changing the user interface significantly. Which approach is most effective?

Accepted Answer

Implement pagination using a StandardSetController to limit the number of records displayed per page.. Pagination with StandardSetController limits the records loaded and rendered per page, reducing view state and improving load time. It is the most effective approach for large data sets in Visualforce without changing the UI significantly. Other options either do not reduce data volume or are not feasible.

Answer

Use JavaScript Remoting to load all records asynchronously after the page renders.

Answer

Set the readOnly attribute of the <apex:page> component to true.

Answer

Increase the view state limit by contacting Salesforce support to raise the limit.

Question 4

A developer is building a Lightning Web Component that should be embedded inside a Visualforce page. The LWC must receive a parameter passed from the Visualforce page and send an event back when a button is clicked. Which combination of features enables this integration?

Accepted Answer

Lightning Out with a dependency app, passing the parameter via the component attribute and receiving the event through a callback registered on the app.. Embedding an LWC in Visualforce requires Lightning Out: a dependency app declares the component, and the VF page instantiates it with $Lightning.use and $Lightning.createComponent. Attributes carry the inbound parameter, and an event handler supplied during creation receives events the component fires. Lightning Message Service, URL-addressable Aura wrappers, and JavaScript remoting each address different problems and cannot both pass a parameter in and return an event out in this context.

Answer

lightning:container and Lightning Message Service, using the published message channel to pass both the parameter and the return event.

Answer

A Visualforce remoting call using JavaScript remoting to invoke the LWC's controller and pass the parameter as a method argument.

Answer

An Aura component wrapper using lightning:isUrlAddressable, passing the parameter through the URL and reading it with the navigation mixin.

Question 5

A developer is building a Lightning Web Component that includes a button. When the button is clicked, the component must navigate the user to a specific Account record page in Lightning Experience. Which approach should the developer use?

Accepted Answer

Use the NavigationMixin from lightning/navigation and call this[NavigationMixin.Navigate] with a standard__recordPage page reference.. NavigationMixin provides a navigate method that accepts a page reference object. For a record page, the page reference type is standard__recordPage with the recordId and actionName attributes. This performs client-side navigation within Lightning Experience, preserving the app context and working in the mobile app. It is the documented, supported pattern for navigating from an LWC.

Answer

Use the lightning-formatted-url component with the record ID and target set to _self.

Answer

Set window.location.href to the record's URL constructed from the Salesforce instance domain.

Answer

Call the Apex method that returns the record URL and then assign it to a property bound to an anchor tag.

Question 6

A developer needs to write an Apex test method that verifies a trigger correctly updates a related Contact when an Account is inserted. The trigger performs a SOQL query and a DML update. What must the developer do to ensure the test passes in a Salesforce sandbox?

Accepted Answer

Create test data for the Account and insert it, then assert the Contact was updated.. For a trigger test to pass, the developer must create the test data that causes the trigger to fire, perform the DML operation, and then assert the expected outcome. Test.startTest() and Test.stopTest() are useful for limit isolation but not sufficient alone. Using SeeAllData=true is risky and unnecessary. Triggers cannot use with sharing. Thus, creating and asserting test data is the correct approach.

Answer

Set the trigger to run in system mode by using with sharing.

Answer

Use the @isTest(SeeAllData=true) annotation to access existing records.

Answer

Use Test.startTest() and Test.stopTest() to isolate the governor limits.

Question 7

A developer is building a Lightning Web Component that must display a toast notification when a record is saved successfully. The component uses lightning/platformShowToastEvent. Which import and usage are correct?

Accepted Answer

Import ShowToastEvent from lightning/platformShowToastEvent and dispatch it with new ShowToastEvent({ title, message, variant }).. To display a toast from an LWC, import the ShowToastEvent class from lightning/platformShowToastEvent, instantiate it with title, message, and variant, and dispatch it from the component. The event bubbles to the Lightning Experience toast container, which renders the notification. This works consistently across Lightning Experience and the Salesforce mobile app.

Answer

Use the lightning-toast base component and set its title, message, and variant attributes in the template.

Answer

Import toast from lightning/toast and call toast.show({ title, message, variant }).

Answer

Import ShowToastEvent from lightning/platformShowToastEvent and call this.ShowToastEvent({ title, message, variant }) without dispatching.

Question 8

A developer needs a Lightning Web Component to navigate the user to a specific Account record's detail page when a button is clicked. Which approach is correct?

Accepted Answer

Import NavigationMixin from lightning/navigation, extend the component class with it, and call this[NavigationMixin.Navigate] with a standard__recordPage page reference.. Client-side navigation in a Lightning Web Component is handled by the NavigationMixin from lightning/navigation. Extending the component class with the mixin and calling the Navigate method with a standard__recordPage page reference moves the user to the Account record page without a full reload. Manually setting the browser location, inventing a navigation base component, or fetching a URL from Apex all bypass the supported API and degrade the user experience.

Answer

Use window.location.href to set the browser URL to the record's Id appended to the Salesforce instance domain.

Answer

Call an Apex method annotated with @AuraEnabled that returns the record's URL and assign it to an anchor's href attribute.

Answer

Import the lightning:navigation base component, place it in the template, and set its recordId attribute to the Account Id.

Question 9

A developer is debugging an Apex class that is failing in production. The developer wants to capture debug logs for a specific user without affecting other users. Which tool should be used to set up a trace flag for that user?

Accepted Answer

Setup Debug Logs. To capture debug logs for a specific user, a developer should use the Debug Logs page in Setup. There, they can create a trace flag for that user, specifying the log levels and duration. This isolates the logging to that user, avoiding impact on others. Other tools like Developer Console are for personal debugging, and Audit Trail is for configuration changes.

Answer

Setup Audit Trail

Answer

Workbench

Answer

Developer Console

Question 10

A developer is designing a Platform Event-driven integration where an external system publishes order events and Apex subscribers update Order records. The team wants to guarantee that a transient downstream outage does not silently drop events, while also preventing duplicate order updates when the same event is redelivered. (Choose two.)

Accepted Answer

Make the Order update idempotent by keying on a unique event identifier stored on the Order, and skip the update if that identifier is already recorded.. Durability across an outage comes from persisting the last processed replayId and resubscribing from it, which replays events still inside the retention window. Because delivery is at least once, duplicate suppression must be handled in the consumer, and idempotent updates keyed on a unique event identifier accomplish that without relying on transport guarantees.

Answer

Increase the event delivery allocation by purchasing additional Platform Event add-on capacity so that redelivery cannot occur.

Answer

Configure the subscriber to use replayId -2 so that only new events are received, and rely on the external publisher to resend anything missed.

Answer

Use a Streaming API push topic on the Order object instead of a Platform Event so that only committed changes are streamed and duplicates are impossible.