c# - How to unit test with a recursive object -

i have object takes in parameter of same type in constructor:

public class person {     private person theparent;     private string thename;     public person(string aname, person aparent)     {         if(aparent == null)         {             thrown new argumentnullexception("aparent");         }         theparent = aparent;         thename = aname;     } } 

in unit test have create new person object constructor requires person object passed in. overcome problem in application getting person object pass in database (using nhibernate , magic)*. don't want tie database access test not testing database functionality. should mock parent object (i'm using rhino mocks in of other tests) or there better way approach this?

*there guaranteed 1 record in databse can retrieve make parent object.

i assume @ point expected reach top node? correct value aparent then?

my guess null, , mean person first in it's line (whatever means application, perhaps adam or something?).