Test Class for Before Trigger in Salesforce

Test Class:

    In the previous post I have posted one Before Trigger .For that Trigger the test class is given Below.

Test Class Code:

  @IsTest

private class Account_Trigger_Test 
{
	private static testMethod void testDelete()
	{
           Account acc=new Account(Name='Test Account;);
           insert acc;
 
           // should succeed
           delete acc;
        }

	private static testMethod void testDeleteFail()
	{
           Account acc=new Account(Name='Test Account',
                                   Client_ID__c='Should fail');
           insert acc;
 
           try
           {
              delete acc;
              // should throw an exception - the following assertion will cause an error if the code carries on
              System.assert(false);
           }
           catch (DMLException e)
           {
               // expected - could assert the message here
           }
        }
}

Before Delete Trigger in Salesforce

Scenario:

    

Write a Trigger on Account Object, All it does is to prevents the Delete of an Account if a particular field(i.e.,Client_ID__c) is not Null.

Trigger Code:

trigger AccountTrigger on Account (before delete) 
{ 
   if(System.Trigger.IsDelete)
   { 
     for (Account acc : trigger.old)
  {
    if (String.isNotBlank(acc.Client_ID__c))
     { 
  acc.addError('You cannot delete This Account Please contact your Salesforce.com Administrator for assistance.');
     }
         } 
   }
 }

Notes:

Trigger.old

Returns a list of the old versions of the sObject records.Note that this sObject list is only available in update and delete triggers.

Trigger.isDelete

Returns true if this trigger was fired due to a delete operation, from the Salesforce user interface, Apex, or the API.

For more information/samples on trigger please check out here

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Hope this helps you..Enjoy..!