Test class for product and pricebook

Test class for product and pricebook:

Product2 prod = new Product2(Name = 'Laptop X200',
                                     Family = 'Hardware');
        insert prod;
       
        Id pricebookId = Test.getStandardPricebookId();
       
        PricebookEntry standardPrice = new PricebookEntry(
            Pricebook2Id = pricebookId, Product2Id = prod.Id,
            UnitPrice = 10000, IsActive = true);
        insert standardPrice;
       
        Pricebook2 customPB = new Pricebook2(Name='Custom Pricebook', isActive=true);
        insert customPB;
       
        PricebookEntry customPrice = new PricebookEntry(
            Pricebook2Id = customPB.Id, Product2Id = prod.Id,
            UnitPrice = 12000, IsActive = true);
        insert customPrice;
       
        List<PricebookEntry> pbez = [SELECT ID, Product2Id, Pricebook2.isStandard, Pricebook2.isActive, isActive FROM PricebookEntry];
       
        system.debug(pbez[0].Pricebook2.isStandard);
        system.debug(pbez[0].Pricebook2.isActive);