Unit testing a method that calls a base class method

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testing

unit-testing

I have a method that looks something like this

public override void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue("someName", this.someName);
            info.AddValue("someName1", this.someName1);
            
            base.GetObjectData(info, context);
        }

If I'm unit testing this method, should I just leave it as it is or should I try and test 'base.GetObjectData()' by iteself by refactoring it out somehow?
How would I unit test this method?

I included a statement that now checks to see if a parameter in null.

if (info == null)
           {
               throw new ArgumentNullException("info");
           }

and I included a test like so

[TestMethod]
        [ExpectedException(typeof(ArgumentNullException))]
        public void GetObjectData_NullParameters_ThrowsException()
        {
            Respondent myRespondent = new Respondent(new RespondentInformation());
            SerializationInfo info = null;
            StreamingContext context = new StreamingContext();
            myRespondent.GetObjectData(info, context);

        }

but isn't there more to test? What else can I test? Shouldn't I be testing the base.GetObjectData' method?