Use puma in the test suite and remove server errors hack

spec/base_spec_helper.rb

@@ -36,7 +36,7 @@ WebMock.disable_net_connect!(
 # in spec/support/ and its subdirectories.
 Dir[Rails.root.join("spec/support/**/*.rb")].sort.each { |f| require f }
 
-Capybara.server = :webrick
+Capybara.server = :puma
 
 Capybara.configure do |config|
   config.match = :prefer_exact

spec/features/consumer/shopping/shopping_spec.rb

@@ -167,12 +167,6 @@ feature "As a consumer I want to shop with a distributor", js: true do
         end
 
         describe "two order cycles and more than 20 products for each" do
-          around do |example|
-            Capybara.raise_server_errors = false
-            example.run
-            Capybara.raise_server_errors = true
-          end
-
           before do
             20.times do
               product = create(:simple_product, supplier: supplier)