Ensure certain field combinations are valid before a record is saved. For instance, if one field is True, ensure another field is not Null

Leave a Comment / Trigger Scenarios / By Ntsh

Let’s consider the Account object for this scenario. Imagine we create two custom fields on the Account object:

Has_Services__c (Checkbox): This field serves to indicate whether an account has active services associated with it.
Service_Renewal_Date__c (Date): This field is designed to store the renewal date of the services linked to the account.

Trigger

trigger AccountTrigger on Account (before insert, before update) {
    if(Trigger.isBefore &amp;&amp; (Trigger.isInsert || Trigger.isUpdate)) {
        AccountTriggerHandler.handleServices(trigger.new);
    } 
}

Apex Class

public class AccountTriggerHandler {
	public static void handleServices(List<account> newAccounts){
        for (Account acc : newAccounts) {
            // If Has_Services__c is true, ensure Service_Renewal_Date__c is not null
            if (acc.Has_Services__c &amp;&amp; acc.Service_Renewal_Date__c == null) {
                acc.addError('Please enter the Service Renewal Date for accounts with active services.');
            }
        }
    }
}

Apex Test Class

@isTest
private class AccountTriggerHandlerTest {
	// Test method to cover scenario where Has_Services__c is true and Service_Renewal_Date__c is null
    @isTest
    static void testAccountWithServicesAndNullRenewalDate() {
        // Create a new Account with Has_Services__c true and Service_Renewal_Date__c as null
        Account acc = new Account(
            Name = 'Test Account',
            Has_Services__c = true
            // Service_Renewal_Date__c is intentionally left null
        );

        System.Test.startTest();
        try {
            insert acc;
            // If the validation is properly set up, this should throw an error
            System.assert(false, 'Expected validation rule to prevent saving with null Service_Renewal_Date__c');
        } catch (DmlException e) {
            // Ensure the correct error message is returned
            System.assertEquals('Please specify the Service Renewal Date.', e.getDmlMessage(0));
        }
        System.Test.stopTest();
    }

    // Test method to cover scenario where Has_Services__c is false and Service_Renewal_Date__c is null
    @isTest
    static void testAccountWithoutServicesAndNullRenewalDate() {
        // Create a new Account with Has_Services__c false and Service_Renewal_Date__c as null
        Account acc = new Account(
            Name = 'Test Account',
            Has_Services__c = false
            // Service_Renewal_Date__c is intentionally left null
        );

        System.Test.startTest();
        try {
            insert acc;
            // If the validation is properly set up, this should not throw an error
            System.assert(true);
        } catch (DmlException e) {
            // If an error occurs unexpectedly, fail the test
            System.assert(false, 'Unexpected error: ' + e.getDmlMessage(0));
        }
        System.Test.stopTest();
    }

}

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