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2025 Salesforce - DEX-450 - Training Programmatic Development using Apex and Visualforce in Lightning Experience For Exam

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q185-Q190):

NEW QUESTION # 185
A developer creates a new Apex trigger with a helper class, and writes a test class that only exercises 95% coverage of the new Apex helper class.
Change Set deployment to production fails with the test coverage warning:
"Test coverage of selected Apex Trigger is 0%, at least 1% test coverage is required." What should the developer do to successfully deploy the new Apex trigger and helper class?

A. Create a test class and methods to cover the Apex trigger.
B. Run the tests using the 'Run All Tests' method.
C. Increase the test class coverage on the helper class.
D. Remove the failing test methods from the test class.

Answer: A

Explanation:
When deploying Apex code to production, Salesforce requires that all Apex triggers have at least 1% code coverage and the overall code coverage must be at least 75%.
In this scenario:
The developer has a test class that covers 95% of the helper class.
The deployment fails because the trigger has 0% coverage.
The error message indicates that the trigger needs at least 1% coverage.
Solution:
Option A: Create a test class and methods to cover the Apex trigger.
Correct Action.
Write a test class that specifically tests the trigger's functionality.
Ensure that the trigger is executed within the test context.
This will increase the trigger's code coverage above the required 1%.
The helper class already has 95% coverage.
Increasing coverage on the helper class does not affect the trigger's coverage.
Option C: Remove the failing test methods from the test class.
Incorrect.
Removing test methods could reduce overall code coverage.
Does not address the issue of the trigger's coverage.
Option D: Run the tests using the 'Run All Tests' method.
Ineffective.
Running all tests does not change the fact that the trigger has 0% coverage.
The trigger must be covered by a test method.
Conclusion:
To successfully deploy the new Apex trigger and helper class, the developer should create a test class and methods that cover the Apex trigger, which is Option A.
Reference:
Writing Test Methods for Triggers
Deployment Requirements
Incorrect Options:
Option B: Increase the test class coverage on the helper class.
Ineffective.

NEW QUESTION # 186
How is a controller and extension specified for a custom object named "Notice" on a Visualforce page?

Answer: B

NEW QUESTION # 187
Given the code below:

What should a developer do to correct the code so that there is no chance of hitting a governor limit?

A. Add a LIMIT clause to the first SELECT SOQL statement.
B. combine the two SELECT statements into a single SOQL statement.
C. Add a WHERE clause to the first SELECT SOQL statement.
D. Rework the code and eliminate the for loop.

Answer: C

NEW QUESTION # 188
Which exception type cannot be caught?

A. LinkException
B. NoAccessException
C. CelloutException
D. custom exception

Answer: A

NEW QUESTION # 189
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 discussion, the UC administrator tried to change the Master-Detail relationship to a Lookup relationship but was not able todo so. What is apossible reason that this change was not permitted?

A. The Account records contain Vendor roll-up summary fields.
B. The Vendor records have existing values in the Account object.
C. The Vendor object must use a Master-Detail field for reporting.
D. The Account object is included on a workflow on the Vendor object.

Answer: A

NEW QUESTION # 190
......

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