libsbml.Model.addRule C# (CSharp) Method

        public int addRule(Rule r)
        {
            int ret = libsbmlPINVOKE.Model_addRule(swigCPtr, Rule.getCPtr(r));
            return ret;
        }

 public void test_Model_addRule5()
 {
     Model m = new  Model(2,2);
       Rule ar = new  AssignmentRule(2,2);
       ar.setVariable( "ar");
       ar.setMath(libsbml.parseFormula("a-j"));
       Rule ar1 = new  AssignmentRule(2,2);
       ar1.setVariable( "ar");
       ar1.setMath(libsbml.parseFormula("a-j"));
       int i = m.addRule(ar);
       assertTrue( i == libsbml.LIBSBML_OPERATION_SUCCESS );
       assertTrue( m.getNumRules() == 1 );
       i = m.addRule(ar1);
       assertTrue( i == libsbml.LIBSBML_DUPLICATE_OBJECT_ID );
       assertTrue( m.getNumRules() == 1 );
       ar = null;
       ar1 = null;
       m = null;
 }