pundit: convert pools to pundit.

test/functional/pool_elements_controller_test.rb

@@ -20,15 +20,15 @@ class PoolElementsControllerTest < ActionDispatch::IntegrationTest
     context "create action" do
       should "add a post to a pool" do
         post_auth pool_element_path, @user, params: {:pool_id => @pool.id, :post_id => @post.id, :format => "json"}
-        @pool.reload
-        assert_equal([@post.id], @pool.post_ids)
+        assert_response :success
+        assert_equal([@post.id], @pool.reload.post_ids)
       end
 
       should "add a post to a pool once and only once" do
         as_user { @pool.add!(@post) }
         post_auth pool_element_path, @user, params: {:pool_id => @pool.id, :post_id => @post.id, :format => "json"}
-        @pool.reload
-        assert_equal([@post.id], @pool.post_ids)
+        assert_response :success
+        assert_equal([@post.id], @pool.reload.post_ids)
       end
     end
   end