//operator<<
    vector<entry> vals_4 {{"Major"}, {"MiG"}, {"M"}, {"Million"}};
    vector<int> ticks_2 {0, 29, 134, 1000000};
    vector<string>result {"[Major 0]", "[MiG 29]", "[M 134]", "[Million 1000000]"};

    ostringstream ss;
    for (int i = 0; i < (int)vals_4.size(); i++)
    {
    entry test(vals_4[i]);
    for (int j = 0; j < ticks_2[i]; j++)
    {
        test++;
    }
    ss << test;
    if(ss.str() == result[i])
        cout << test << " passed\n";
    else
    {
        cout << "Problem with " << test << "\n";
    }
    ss.str("");
    }
    //operator>>
    vector<string> entry_objects {"[Sukhoi 15]", "[Uranium 235]", "[Pip-Boy 3000]", "Error 1]", "[Error 2"};
    vector<string> vals_5 {"Sukhoi", "Uranium", "Pip-Boy"};
    vector<int> ticks_3 {15, 235, 3000, 1, 2};

    for (int i = 0; i < (int)entry_objects.size(); i++)
    {
        try
        {
            entry et("");
            istringstream is;
            is.str(entry_objects[i]);
            is >> et;
            if(*et == vals_5[i] && (int)et == ticks_3[i])
                cout << entry_objects[i] << " passed\n";
             else
            {
                cout << "Problem with " << entry_objects[i] << "\n";
            }
        }
        catch(invalid_argument& err)
        {
            err.what();
        }
    }