public void PersonDeletePhone()
{
string name = "maichao";
string company = "ynu";
string position = "student";
Person person = new Person {
Name = name, Company = company, Position = position
};
Pair <string, string> num1 = new Pair <string, string>("187", "cellphone");
Pair <Guid, Pair <string, string> > phone1 = new Pair <Guid, Pair <string, string> >(Guid.NewGuid(), num1);
person.AddPhone(phone1);
Pair <string, string> num2 = new Pair <string, string>("187", "cellphone");
Pair <Guid, Pair <string, string> > phone2 = new Pair <Guid, Pair <string, string> >(Guid.NewGuid(), num2);
person.AddPhone(phone2);
person.DeletePhoneById(new Guid(phone1.Key.ToString()));
Assert.AreEqual(1, person.Phones.Count);
}