Test is not going inside "trigger.new" while testing Salesforce Trigger

In my trigger testing, the test is not going inside trigger.new

`
trigger Setpricebookentry1 on Product2 (after insert)
{
Set prodIdSet = Trigger.newMap.keySet();
list listpbe=new list();
Pricebook2 prbook=[select id from Pricebook2 where isStandard=true and isActive=true];
system.debug('++++++>'+prbook);
for(Product2 po:Trigger.New)
{
system.debug('=====>'+trigger.new);
Pricebookentry pbe=new Pricebookentry();
pbe.UnitPrice=10;
pbe.Pricebook2Id=prbook.id;
pbe.Product2Id=po.id;
listpbe.add(pbe);
}
if(listpbe.size()>0)
{
insert listpbe;
system.debug('------>'+listpbe);
}
}
`

this is my test code

`
@istest
public class TestSetpricebookentry1
{
@istest
public static void mytest()
{
Product2 po=new Product2();
po.Name='Raghav';
po.IsActive=true;
insert po;
Id pricebookId = Test.getStandardPricebookId();
PricebookEntry standardPrice = new PricebookEntry();
standardPrice.Pricebook2Id = pricebookId;
standardPrice.Product2Id =po.Id;
standardPrice.UnitPrice = 10000;
standardPrice.IsActive = true;
insert standardPrice;
}
}
`