[rules-users] I am not sure if this is Bug in Guvnor - Please help

Hi All , I have defined a function name *join *using guvnor guided editor which is mentioned below function String join(String firstname , String lastname) { return firstname + " " + lastname; } then i created rule using guided editor which make use of the function and when i validate the rule is validates successfully rule "persontest" dialect "mvel" when p : Person( firstname != "" && lastname != "" ) then p.setFullname( join(firstname,lastname) ); end now i created a test scenario for testing the rule which is like below GIVEN insert Person firstname =Sujit lastname =Sharma EXPECT fullname = Sujit Sharma and when i run the test i am getting below error [p] field [fullname] was [] expected [Sujit Sharma ] Please help. Regards, Ashish