Add save_and_open spec helper method to open HTML emails in the browser

spec/spec_helper.rb

@@ -92,6 +92,7 @@ RSpec.configure do |config|
   config.include OpenFoodNetwork::FeatureToggleHelper
   config.include OpenFoodNetwork::EnterpriseGroupsHelper
   config.include OpenFoodNetwork::DistributionHelper
+  config.include OpenFoodNetwork::HtmlHelper
   config.include ActionView::Helpers::DateHelper
   config.include OpenFoodNetwork::DelayedJobHelper
 

spec/support/html_helper.rb

@@ -0,0 +1,10 @@
+module OpenFoodNetwork
+  module HtmlHelper
+    def save_and_open(html)
+      require "launchy"
+      file = Tempfile.new('html')
+      file.write html
+      Launchy.open(file.path)
+    end
+  end
+end