// Insert a test product.
List<Product2> products = new List<Product2>();
for(Integer i = 0; i < 5; i++) {     
    Product2 product = new Product2();
    product.name='Product '+i; 
    product.Description = 'desc '+i;
    products.add(product);
} 
insert products; 
System.debug('Adding Products: ' + products);

// Get standard price book ID.
Id pricebookId = Test.getStandardPricebookId();
System.debug('Getting pricebookId: ' + pricebookId);

// Insert a price book entry for the standard price book.
List<PricebookEntry> pbes = new List<PricebookEntry>();
for(Integer i = 0; i < products.size(); i++) {
    PricebookEntry pbeUSD = new PricebookEntry();
    pbeUSD.Pricebook2Id = pricebookId;
    pbeUSD.IsActive = true;
    pbeUSD.Product2Id = products[i].Id;
    pbeUSD.UnitPrice = 12345;
    pbeUSD.CurrencyIsoCode = 'USD';
    pbes.add(pbeUSD);
}
insert pbes;
System.debug('Adding Pricebookentries: ' + pbes);

// Create a custom price book
Pricebook2 customPB = new Pricebook2(Name=PRICEBOOKNAME, isActive=true);
insert customPB;
System.debug('Adding customPB: ' + customPB);

// Insert a price book entry with a custom price.
List<PricebookEntry> customPricebookEntries = new List<PricebookEntry>();
for(Integer i = 0; i < products.size(); i++) {
    PricebookEntry pbeUSD = new PricebookEntry();
    pbeUSD.Pricebook2Id = customPB.Id;
    pbeUSD.IsActive = true;
    pbeUSD.Product2Id = products[i].Id;
    pbeUSD.UnitPrice = 0;
    pbeUSD.CurrencyIsoCode = 'USD';
    customPricebookEntries.add(pbeUSD);
}
insert customPricebookEntries;
System.debug('Adding Custom PricebookEntries: ' + customPricebookEntries);