The CreatePacktSetupWithGiftToleranceQty helper function's main purpose is to set GiftToleranceQty on the extension setup, and is given by the following code:

local procedure
    CreatePacktSetupWithGiftToleranceQty(
        GiftToleranceQtySet: Decimal)
var
    PacktExtensionSetup: Record "Packt Extension Setup";
begin
    with PacktExtensionSetup do begin
        if not Get() then
            Insert();
        Validate("Gift Tolerance Qty", GiftToleranceQtySet);
        Modify();
    end;
end;