Replaced negative operator

test/test_helper.rb

@@ -9,6 +9,6 @@ class ActiveSupport::TestCase
 
 
   #Returns true if a test user is logged in. 
   #Returns true if a test user is logged in. 
   def is_logged_in?
   def is_logged_in?
-    !session[:user_id].nil?
+    session[:user_id].present?
   end
   end
 end
 end