Hi all, i am trying to write a test method for a private method and  my  test methods is in seperate test class.My methosd has a "private static" modifier  but after writing test method as

 static testMethod void test_getRestrictedProfileSet()
        {
            Test.startTest();
            ProductsAndServicesController testgetprofile=new ProductsAndServicesController();
            system.assert(testgetprofile.getRestrictedProfileSet()!=null);
            Test.stopTest();
        }

i am getting this error::::::Error: Compile Error: Method is not visible: [ProductsAndServicesController].getRestrictedProfileSet() at line 16 column 27...............................can anybody help me in solving this problem.It will be so helpful for me.