Test the Change Event Trigger | Change Data Capture Basics
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Change Data Capture Basics
Test the Change Event Trigger
Learning Objectives
After completing this unit, you’ll be able to:
Write an Apex test class for the Apex change event trigger.
Run the test and provide test coverage for the Apex change event trigger.
Testing the Change Event Trigger
Now that you've learned how to write a change event trigger, let’s write a test for it. Testing your trigger is important not just as a good practice but it is also enforced by the platform. Before you can package or deploy Apex triggers to production, you must provide Apex tests and sufficient code coverage.
Write a Test Class
Create a test method to provide test coverage for the OpportunityChangeTrigger that you created in the previous unit’s challenge.
Prework: Pass the previous unit’s challenge to create the trigger.
Create an Apex test class for your trigger modeled after the example TestEmployeeChangeTrigger code:
Class Name: TestOpportunityChangeTrigger
Method Name: testCreateAndUpdateOpportunity
Copy the body of the test method from the TestEmployeeChangeTrigger example class. You will modify it next.
In the test method, keep the first statement: Test.enableChangeDataCapture();
Create an opportunity:
Name: Sell 100 Widgets
StageName: Prospecting
CloseDate: Date.today().addMonths(3)
Call Test.getEventBus().deliver(); to fire the trigger.
Delete the verification section because you don't need to verify the trigger execution yet. You will do so later.
Modify the SOQL query to retrieve the StageName field from Opportunity.
Opportunity[] oppRecords = [SELECT Id,StageName FROM Opportunity];
Opportunity opp = oppRecords[0];
Update the stage name to Closed Won.
opp.StageName = 'Closed Won';
update opp;
Call Test.getEventBus().deliver(); to fire the trigger.
Query Task records using a SOQL query and verify that one task is returned.
Task[] taskList = [SELECT Id,Subject FROM Task];
System.assertEquals(1, taskList.size(), 'The change event trigger did not create the expected task.');
Run the test class and ensure that it passes and provides 100% coverage for the trigger.
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