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nilesh walkenilesh walke 

Whenever an account phone is modified, update all the contacts of the account

public static void ForQnoSIX(List<account> oldAccount, List<account> Ac4){
        List<contact> conList=[select lastname,otherphone,accountid,mobilePhone from contact 
                               where accountid IN: Ac4];
        map<id,string> oldAccidVsPhone= new map<id,string>();
        map<id,string> newAccidVsPhone= new map<id,string>();
        for(account newAcc: Ac4){
            for(account oldAcc: oldAccount){
                if(newAcc.phone!=oldAcc.phone && oldAcc.id==newAcc.id){
                    oldAccidVsPhone.put(oldAcc.id,oldAcc.phone);
                    newAccidVsPhone.put(newAcc.id,newAcc.phone);
                }
            }
        }
        list<contact> updateContactList= new List<contact>();
        for(contact con: conList){
            if(oldAccidVsPhone.containskey(con.accountid)){
                con.otherphone=oldAccidVsPhone.get(con.accountid);
                con.mobilePhone=newAccidVsPhone.get(con.accountid);
                updateContactList.add(con);
            }
        }
        if(updateContactList.size()>0){
            update updateContactList;
        }
    } 


i need test class for it 
thanks for helping me out 
stayinpgsz stayinpgszstayinpgsz stayinpgsz
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ANUTEJANUTEJ (Salesforce Developers) 
Hi Nilesh,

You can try the below snippet:
  
trigger AccountTrigger on Account (after update) {
    if(Trigger.isAfter && trigger.isUpdate) { 
Classname.ForQnoSIX(trigger.oldmap, trigger.newmap)
}
    }
  
public static void ForQnoSIX(Map<id,account> oldAccountmap, Map<id,account> Ac4){
set<id> idset= Ac4.keyset();
        List<contact> conList=[select lastname,otherphone,accountid,mobilePhone from contact 
                               where accountid IN: idset];

      list<contact> updateContactList= new List<contact>();
     
   for(contact con: conList){
Account OldAccount = oldAccountmap.get(con.AccountId);
Account NewAccount= Ac4.get(con.AccountId);
            if(NewAccount.phone!=OldAccount.phone){
                con.otherphone=OldAccount.phone;
                con.mobilePhone=NewAccount.phone;
                updateContactList.add(con);
            }
        }
        if(updateContactList.size()>0){
            update updateContactList;
        }
    }
  
@isTest()
public class ForQnoSIXTest
{
    private static testMethod void testUpdateCaseMethod() 
	{
        Account a= new account();
        a.name='test';
        insert a;
        
        Contact c= new contact();
        c.AccountId= a.id;
        c.phone =56789123;
        insert c;
        
        Account Temp= new Account();
        Temp.id= a.id;
        Temp.phone=123456789;
        update Temp;

        Contact c = [select id,phone from contact where id in :c.id];

system.assertNotEquals(123456789, c.phone, 'The value of phone on contact should same as account.');
    }
    
}

Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.  

Thanks.
CharuDuttCharuDutt
Hii Nilesh Walke
Try Below Code Made A Small Change In Your Class 
public static void ForQnoSIX(List<account> oldAccount, List<account> Ac4){
        List<contact> conList=[select lastname,otherphone,accountid,mobilePhone from contact 
                               where accountid IN: Ac4];
        map<id,string> oldAccidVsPhone= new map<id,string>();
        map<id,string> newAccidVsPhone= new map<id,string>();
        for(account newAcc: Ac4){
            for(account oldAcc: oldAccount){
                if(newAcc.phone!=oldAcc.phone/* && oldAcc.id==newAcc.id*/){
                    oldAccidVsPhone.put(oldAcc.id,oldAcc.phone);
                    newAccidVsPhone.put(newAcc.id,newAcc.phone);
                }
            }
        }
        list<contact> updateContactList= new List<contact>();
        for(contact con: conList){
            if(oldAccidVsPhone.containskey(con.accountid)){
                con.otherphone=oldAccidVsPhone.get(con.accountid);
                con.mobilePhone=newAccidVsPhone.get(con.accountid);
                updateContactList.add(con);
            }
        }
        if(updateContactList.size()>0){
            update updateContactList;
        }
    } 




Test Class:
@isTest
public class unitest {
  @isTest
    public static void unittest(){
       integer k=0;
       list<Contact>lstCon = new list<Contact>();
        list<Account>lstAcc = new list<Account>();
        list<Account>UpdatelstAcc = new list<Account>();
        For(integer i=0;i<5;i++){
            Account acc = new Account();
            acc.Name = 'testAcc ' + i;
            acc.Phone = '123456789'+i;
            lstAcc.add(acc);
        }
        insert lstAcc;
        
        For(integer i=0;i<5;i++){
            Contact Con = new Contact();
            con.LastName = 'testAcc ' + i;
            Con.Phone = '7654389321'+i;
            Con.otherphone = '7654389321'+i;
            Con.mobilephone = '7654389321'+i;
            for(integer z=0;z<lstAcc.Size();z++){
            Con.AccountId = lstAcc[z].id;
                }
            lstCon.add(Con);
        }
        insert lstCon;
        for(Account updateAcc: lstAcc){
            if(updateAcc.Id == lstAcc[k].Id){
            updateAcc.Phone ='123654789'+k++;
            }
            UpdatelstAcc.Add(updateAcc);
        }
        update UpdatelstAcc;
        
        testClass.ForQnoSIX(lstAcc, UpdatelstAcc);
    }

}
Please Mark It As Best Answer If It Helps
 Thank You!