controllers with rspec3 syntax

spec/controllers/admin/admin_controller_spec.rb

@@ -5,13 +5,13 @@ describe Admin::AdminController do
   context 'index' do
 
     it 'needs you to be logged in' do
-      lambda { xhr :get, :index }.should raise_error(Discourse::NotLoggedIn)
+      expect { xhr :get, :index }.to raise_error(Discourse::NotLoggedIn)
     end
 
     it "raises an error if you aren't an admin" do
       user = log_in
       xhr :get, :index
-      response.should be_forbidden
+      expect(response).to be_forbidden
     end
 
   end