RandomContactFactory

public class RandomContactFactory {

    public static List<Contact> generateRandomContacts(Integer numOfContacts, String lName) {
        List<Contact> cList = new List<Contact>();
        for(Integer i=0; i<numOfContacts; i++) {
            Contact c = new Contact(Firstname = 'Test' + i, Lastname = lName);
            conList.add(c);
        }
        return cList;
    }

}