Latest commit 5f78451 Jul 2, 2015 @szalansky szalansky Fix creation of tempfiles in Rack::Test::UploadedFile
Tempfile's initializer is not very intuitive. If you want your tempfile
to have an extension you have to pass an array with two elements:
  - basename
  - extension (with a dot at the beginning)

This change makes it behave more like original Rack::Multipart::UploadedFile.