Describe How to Write Unit Tests for Triggers, Controllers, and Classes. PLATFORM-DEVELOPER-I Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   How can a unit test verify that a trigger correctly handles the 'after insert' context?

   • ABy calling the trigger directly as a method
   • BBy deleting a record and verifying the trigger's error message
   • CBy updating a record and checking that the trigger did not fire
   • DBy inserting a record and then querying the related records that the trigger should have updated
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2. 7foundation · easy

   A developer is writing a unit test for a standard controller extension. Which constructor parameter is required to instantiate the extension?

   • AA list of records to display
   • BAn ApexPages.StandardController instance
   • CA Map of parameters from the page
   • DA PageReference to the Visualforce page
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4. 8application · medium

   A developer wrote a class `AccountHelper` with a method `getAccountNames(List<Account> accounts)` that returns a list of account names. The developer is writing a unit test for this method. Which test method correctly verifies the method's behavior?

   • AUse `System.assert` to check that the method returns a list of Account objects.
   • BCall `getAccountNames()` with an empty list and assert it returns null.
   • CCreate a list of Account records with known names, call `getAccountNames()`, and use `System.assertEquals` to compare the returned list to the expected list of names.
   • DInsert a single Account, call `getAccountNames()` with a list containing that Account, and assert the list size is 1.
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5. 9foundation · easy

   A developer writes a unit test for a trigger that updates related records when an Account is inserted. Which sequence of operations must the test method perform to properly exercise the trigger?

   • AInsert an Account, then query the related records and assert the expected field values.
   • BInsert an Account and then immediately assert that the trigger did not change any records.
   • CDelete an Account and then assert that the related records were updated.
   • DQuery the related records first, then insert an Account and assert the query results.
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6. 10application · medium

   A developer is writing a unit test for a trigger that sends an HTTP callout when an Account is inserted. The trigger uses a named credential for authentication. What must the developer do to test the callout?

   • ASet the named credential to a test endpoint in the test method.
   • BUse `Test.setMock(HttpCalloutMock.class, new MyCalloutMock())` before inserting the Account.
   • CInsert the Account and let the callout execute; the test will pass if the callout succeeds.
   • DUse `Test.startTest()` and `Test.stopTest()` around the insert to allow the callout.
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