对上述程序给出main函数测试

好的，下面是一个简单的 main 函数，用于测试 PhoneBook 类的实现：

int main() {
    PhoneBook phoneBook;

    // 添加联系人
    phoneBook.addContact("Alice", "123456");
    phoneBook.addContact("Bob", "234567");
    phoneBook.addContact("Charlie", "345678");

    // 根据姓名查找电话号码
    cout << "Alice's number: " << phoneBook.findNumber("Alice") << endl;
    cout << "Bob's number: " << phoneBook.findNumber("Bob") << endl;
    cout << "Charlie's number: " << phoneBook.findNumber("Charlie") << endl;

    // 根据电话号码查找姓名
    cout << "123456's name: " << phoneBook.findName("123456") << endl;
    cout << "234567's name: " << phoneBook.findName("234567") << endl;
    cout << "345678's name: " << phoneBook.findName("345678") << endl;

    // 删除联系人
    phoneBook.removeContact("Bob");

    // 根据姓名查找电话号码
    cout << "Alice's number: " << phoneBook.findNumber("Alice") << endl;
    cout << "Bob's number: " << phoneBook.findNumber("Bob") << endl;
    cout << "Charlie's number: " << phoneBook.findNumber("Charlie") << endl;

    // 根据电话号码查找姓名
    cout << "123456's name: " << phoneBook.findName("123456") << endl;
    cout << "234567's name: " << phoneBook.findName("234567") << endl;
    cout << "345678's name: " << phoneBook.findName("345678") << endl;

    // 将电话簿导出到文件
    phoneBook.exportToFile("phonebook.txt");

    // 从文件导入电话簿
    PhoneBook phoneBook2;
    phoneBook2.importFromFile("phonebook.txt");

    // 根据姓名查找电话号码
    cout << "Alice's number: " << phoneBook2.findNumber("Alice") << endl;
    cout << "Bob's number: " << phoneBook2.findNumber("Bob") << endl;
    cout << "Charlie's number: " << phoneBook2.findNumber("Charlie") << endl;

    // 根据电话号码查找姓名
    cout << "123456's name: " << phoneBook2.findName("123456") << endl;
    cout << "234567's name: " << phoneBook2.findName("234567") << endl;
    cout << "345678's name: " << phoneBook2.findName("345678") << endl;

    return 0;
}

这个测试程序中，我们首先添加了三个联系人，然后测试了根据姓名查找电话号码和根据电话号码查找姓名的功能。接着，我们删除了一个联系人，再次测试了查找功能。最后，我们将电话簿导出到文件，并从文件中导入电话簿，测试了导入导出功能。你可以根据自己的需求来编写测试程序。