prevents timelines spec to change settings for following specs

spec/models/timeline_spec.rb

@@ -36,12 +36,14 @@
         ba = FactoryGirl.create(:user, :firstname => 'b', :lastname => 'a')
         t  = Timeline.new
 
-        Setting.user_format = :firstname_lastname
+        with_settings :user_format => :firstname_lastname do
           t.available_responsibles.should == [ab, ba]
+        end
 
-        Setting.user_format = :lastname_firstname
+        with_settings :user_format => :lastname_firstname do
           t.available_responsibles.should == [ba, ab]
         end
       end
     end
   end
+end

spec/support/settings.rb

@@ -30,7 +30,13 @@
 # Runs block with settings specified in options.
 # The original settings are restored afterwards.
 def with_settings(options, &block)
-  saved_settings = options.keys.inject({}) {|h, k| h[k] = Setting[k].dup; h}
+  saved_settings = options.keys.inject({}) do |h, k|
+    h[k] = Setting[k].is_a?(Symbol) ?
+              Setting[k] :
+              Setting[k].dup
+    h
+  end
+
   options.each { |k, v| Setting[k] = v }
   yield
 ensure