list - doctest で長い文字列をテストする

Question

doctest を使用して次のコードをテストする必要があります。私はdoctestでなければならず、他の方法ではありません。「期待：何もありません」というメッセージが表示され続けます。これを行う方法はありますか？

import pickle

#Loading lists from file using the pickle module
with open('stocklist.txt', 'rb') as f:     #Reading the list of stock from a text file. "rb" or "read binary" is used
        thelist = pickle.load(f)


def showstocklist():     #Defining a function for viewing the all information about the current items in the list
    """ This function displays complete information about every item in stock.
        Each item is diplayed in the form:
        Software Name     Sofware Medium     Copies Available     Supplier     Index Number of Item

        >>> showstocklist()

        This is the current list of software available in stock:

        ----------------------------------------------------------------------------------------------------------
        Ms Office     Medium = CD     Copies Available = 7     Supplier = Microsoft     Index Number = 0
        ----------------------------------------------------------------------------------------------------------
        Norton Antivirus     Medium = DVD     Copies Available = 24     Supplier = Symantec     Index Number = 1
        ----------------------------------------------------------------------------------------------------------
        Paint     Medium = DVD     Copies Available = 12     Supplier = The Eagle Company     Index Number = 2
        ----------------------------------------------------------------------------------------------------------
        """
    print("")
    print("This is the current list of software available in stock:")
    print("")
    print("----------------------------------------------------------------------------------------------------------")
    for (index,[item,medium,quantity,supplier]) in enumerate(thelist):    #Displaying all item information from list along with their index number
        print (str(item), "    Medium = " + str(medium), "    Copies Available = " + str(quantity), "    Supplier = " + str(supplier), "    Index Number = " + str(index))
        print("----------------------------------------------------------------------------------------------------------")

if __name__ == "__main__":
    import doctest
    doctest.testmod(verbose = True)