add formData support

test-app/spec/spec_helper.rb

@@ -47,6 +47,10 @@ RSpec.configure do |config|
   # triggering implicit auto-inclusion in groups with matching metadata.
   config.shared_context_metadata_behavior = :apply_to_host_groups
 
+  config.after(:suite) do
+    File.delete("#{Rails.root}/tmp/thumbnail.png") if File.file?("#{Rails.root}/tmp/thumbnail.png")
+  end
+
 # The settings below are suggested to provide a good initial experience
 # with RSpec, but feel free to customize to your heart's content.
 =begin