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Salesforce DEX-450 Exam Questions
- Topic 1: Describe how triggers fit into and can be impacted by the Order of Execution/ Building a Data Model on the Salesforce Platform
- Topic 2: Referencing Custom Controllers and Controller Extensions/ Use the sObject data type, the primitive data types, and basic control statements in Apex
- Topic 3: Process the result of a query in Apex/ Understanding Record Types/ Use trigger context variables
- Topic 4: Describe strategies for Testing Visualforce controllers/ Use SOQL to Query Parent-Child Relationships
- Topic 5: Write a query that traverses a child-to-parent and parent-to-child relationship/ Creating Roll-Up Summary Fields
- Topic 6: Write a basic query using Salesforce’s query language, SOQL/ Write Apex to invoke DML operations and handle DML errors
- Topic 7: Write tests for action methods, getters, setters, and properties/ List the differences between the ways you can invoke DML operations
- Topic 8: Describe the syntax of a trigger definition/ Display data from a record in a Visualforce page
- Topic 9: Describe common limit issues and security concerns/ Launch a Visualforce page using a custom button
- Topic 10: Visualforce Development Considerations and Testing/ Determine what data an Apex class can access
- Topic 11: Describe the memory lifecycle for static attributes/ Use Platform Events for Immediate Error Logging
- Topic 12: Describe practices for writing code that is easy to maintain and extend/ Write triggers and classes that assume batches of data as input
Free Salesforce DEX-450 Exam Actual Questions
Note: Premium Questions for DEX-450 were last updated On Feb. 11, 2025 (see below)
Universal Containers (UC) uses a custom object called Vendor. The Vendor custom object has a master-detail relationship with the standard Account object.
Based on some internal discussions, the UC administrator tried to change the master-detail relationship to a lookup relationship, but was not able to do so.
What is a possible reason that this change was not permitted?
The values 'High', 'Medium', and 'Low' are identified as common values for multiple picklists across different objects.
What is an approach a developer can take to streamline maintenance of the picklists and their values, while also restricting the values to the ones mentioned above?
Universal Containers is developing a new Lightning web component for their marketing department. They want to ensure that the component is fine-tuned and provides a seamless user experience.
What are some benefits of using the Lightning Component framework?
How can a developer check the test coverage of autolaunched Flows before deploying them in a change set?
As of Winter '20 (API version 47.0), Salesforce introduced the ability to test Autolaunched Flows with test coverage.
However, as of the current knowledge cutoff (2023-09), there is no direct way within the Salesforce UI to check the test coverage of autolaunched flows before deploying them via change sets.
To check the test coverage of flows, developers can use the Tooling API to query for test coverage.
Option A: Use SOQL and the Tooling API.
Correct Answer.
Developers can use the Tooling API to query for Flow test coverage information.
By executing a SOQL query on FlowTestCoverage and FlowVersionView objects via the Tooling API, developers can retrieve coverage data.
This allows checking flow test coverage programmatically before deployment.
The Flow Properties page does not provide test coverage information.
It allows configuring flow settings but not checking test coverage.
Option C: Use the Code Coverage Setup page.
Incorrect.
The Code Coverage page in Setup pertains to Apex code coverage, not Flow coverage.
Option D: Use the ApexTestResult class.
Incorrect.
The ApexTestResult class is used for Apex test results.
It does not provide information on Flow test coverage.
Conclusion:
To check the test coverage of autolaunched Flows before deploying them in a change set, a developer should use SOQL and the Tooling API, which is Option A.
Flow Test Coverage with Tooling API
Use Tooling API to Check Flow Coverage
Incorrect Options:
Option B: Use the Flow Properties page.
Incorrect.
A developer needs to have records with specific field values in order to test a new Apex class.
What should the developer do to ensure the data is available to the test?
To ensure that specific data is available in test methods, the developer should create test data within the test context.
Option B: Use Test.loadData() and reference a CSV file in a static resource.
Correct Approach.
Test.loadData() is a method that allows test methods to load test data from a CSV file stored as a static resource.
This method creates the records in the test context, ensuring that the data is available during the test execution.
Using a CSV file makes it easy to define multiple records with specific field values.
Usage Example:
@isTest
private class MyTestClass {
@isTest
static void testMethod() {
List<MyObject__c> testRecords = (List<MyObject__c>) Test.loadData(MyObject__c.sObjectType, 'MyTestData');
// Proceed with testing using testRecords
}
}
Where 'MyTestData' is the name of the static resource containing the CSV file.
Test.loadData() does not support loading data from JSON files or from the Documents object.
It uses CSV files stored as static resources.
Option C: Use Anonymous Apex to create the required data.
Not Effective for Testing.
Data created via Anonymous Apex is not available in test methods due to data isolation.
Test methods operate in their own context and cannot access data created outside the test unless SeeAllData=true is used, which is discouraged.
Option D: Use SOQL to query the org for the required data.
Not Recommended.
Test methods should not rely on existing org data.
Tests should create their own data to ensure consistency and avoid dependencies.
Using SeeAllData=true is discouraged.
Conclusion:
To ensure that records with specific field values are available in the test, the developer should use Test.loadData() with a CSV file stored in a static resource.
Therefore, Option B is the correct answer.
Options Not Suitable:
Option A: Use test.loadData() and reference a JSON file in Documents.
Incorrect.
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