Test for products without @isAllTestData

@isTest
private class TrgOpportunityTest {

  @isTest static void test_method_one() {

    Account a = new Account();
    a.Name = 'Wallyu';
    insert a;

    Opportunity o = new Opportunity(
      Name = 'Merchandisebo',
      Autorenew__c = 'Yes',
      Account = a,
      StageName = 'Contract',
      CloseDate = DateTime.Now().Date(),
      Term_2_License_Start_Date__c = DateTime.Now().Date(),
      Term_2_License_End_Date__c = DateTime.Now().Date().addYears(1),
      HasBeenRenewed__c = false,
      Bill_When__c = 'In Arrears');
    insert o;

    System.debug(LoggingLevel.WARN, '@@@TrgOpportunityTest.o : ' + o);

    Product2 p2 = new Product2(Name='Test Productrrrr',isActive=true);
    insert p2;

    Id pricebookId = Test.getStandardPricebookId();
    PricebookEntry pbe = new PricebookEntry(Pricebook2Id=pricebookId, Product2Id=p2.Id, UnitPrice=99, isActive=true);
    insert pbe;

    OpportunityLineItem oli = new OpportunityLineItem(PriceBookEntryId=pbe.Id, OpportunityId=o.Id, Quantity=1, TotalPrice=99,Description='sdfsdfsdf');
    List  olilist=new List{oli};
    insert (olilist);

    Test.startTest();
    o.StageName = 'Purchased';
    upsert o;
    System.debug(LoggingLevel.WARN, '@@@TrgOpportunityTest.o AFTER UPSERT : ' + o);
    Test.stopTest();
  }
}