Hello all,

I have created below trigger and a test class for it, still its not covering the trigger. What needs to be changed in this test class?
Please help

Trigger:
trigger OppTask on Opportunity (after update) {
    List <Contact> conList = [SELECT ID,AccountID FROM Contact WHERE AccountId IN (SELECT AccountId FROM Opportunity WHERE Id IN :Trigger.new)];
    map<ID,Contact> accountIDWithContactMap = new map<ID,Contact>();
    for(Contact con : conList){
        accountIDWithContactMap.put(con.AccountID, con);
    }    
    for(Opportunity Opp : Trigger.new){
        if(Trigger.newMap.get(opp.Id).StageName != Trigger.oldMap.get(opp.Id).StageName && opp.StageName == 'Closed Won' && accountIDWithContactMap.containsKey(Opp.AccountId)){
            Task T = new Task();
            T.WhatId = opp.Id;            
            T.OwnerId = opp.OwnerId;
            T.Subject = 'Call';
            T.Status = 'In Progress';
            T.IsReminderSet = TRUE;
            T.WhoId = accountIDWithContactMap.get(Opp.AccountId).ID;
            T.ReminderDateTime = DateTime.now().addHours(24);
            
            insert T;
    
        }
        
        
    }



Test Class:
@isTest

public class testOppTaskTrigger{
    static testMethod void ValidateOppTaskTrigger(){
    Test.startTest();
    Account testAcc = new Account (Name = 'Test Account');
    insert testAcc;
    
    User U = [SELECT ID, Name FROM User WHERE Profile.Name = 'System Administrator'];
    
    Opportunity testOpp = new Opportunity (Name = 'Test Name',
                                     OwnerId =U.Id,
                                     AccountId = testAcc.Id,
                                     StageName = 'Open',
                                     Amount = 50000.00,
                                     CloseDate = System.today()
                                     );
    
    insert testOpp;
    
    Opportunity testOpp2 = [SELECT Name, Id, StageName FROM Opportunity WHERE Id =: testOpp.Id];
                            if(testOpp2.StageName == 'Closed Won') {
                            update testOpp;
    
    Task testTask = new Task ( WhatId = testOpp2.Id,            
            OwnerId = testOpp2.OwnerId,
            Subject = 'Call',
            Status = 'In Progress',
            IsReminderSet = TRUE,
            ReminderDateTime = DateTime.now().addHours(24));                                
     
     
     insert testTask;
     Test.stopTest();
    }
    }

}