// The Purpose of this Trigger is to get the Count of Total Number of Childern the parent account has.


trigger countChildAccount on Account (after Insert, after Update, before delete) {
    Set<id> ids= new Set<id>();
    List<Account> acclist = new List<Account>();
    Integer count = 0;
    
    if(Trigger.isInsert || Trigger.isUpdate){
        for(Account acc: Trigger.new){
            if(acc.Ultimate_Parent_Client__c!=null)
                ids.add(acc.Ultimate_Parent_Client__c);
            acclist.add(acc);
        }
    }
    
    if(Trigger.isDelete){
        for(Account acc: Trigger.old){
            if(acc.Ultimate_Parent_Client__c!=null)
                ids.add(acc.Ultimate_Parent_Client__c);
            acclist.add(acc);
        }
    }
        
    if(ids.size()>0){
        List<Account> accchild = new List<Account>([select id,Ultimate_Parent_Client__c from Account where Ultimate_Parent_Client__c IN: ids]);
        List<Account> accparent = new List<Account>([select id,No_of_Child_Accounts__c from Account where id IN: ids]);
        for(Account ac: accparent){
            count =0;
            for(Account acchild: accchild){
                if(acchild.Ultimate_Parent_Client__c == ac.id)
                    count++;
            }
            ac.No_of_Child_Accounts__c = count;            
        }
        try{
            upsert accparent;
        }catch(DMLException ex){
            System.debug('Exception is '+ex);
        }
    }
}

@isTest
private class TestCountChildAccount {

    static testMethod void AccountSumTest() {
 
        
        
        Account tstAcct = new Account ( Name = 'Test932',
                                       BillingCity ='ultAccforDSAutomationTestCity',
                                               BillingCountry ='ultAccforDSAutomationCountry',
                                               BillingStreet ='ultAccforDSAutomationSt',
                                               BillingPostalCode ='536768',
                                               phone = '010101',
                                               Ultimate_Parent__c = True
                                      );
        insert tstAcct;

         Account tstAcct1 = new Account ( Name = 'Test932',
                                       BillingCity ='ultAccforDSAutomati1onTestCity',
                                               BillingCountry ='ultAccfo1rDSAutomationCountry',
                                               BillingStreet ='ultAccforD1SAutomationSt',
                                               BillingPostalCode ='5367618',
                                               phone = '0101101',
                                               Ultimate_Parent_Client__c = tstAcct.id
                                      );
Test.StartTest();
       Insert tstAcct;
Test.StopTest();

System.AssertEquals('1','No_Of_Child_Accounts__C');
        tstAcct.fax = '2344';
        
        update tstAcct;
        
        delete tstAcct;
        
        undelete tstAcct;

    }

}

HI , I have a Trigger which counts the total number of child accounts the parent account has , I am having difficulty in getting test coverage , any help on this one Plz

Thanks 

Akhil.