Adding a unit test for Upfile and updating a few content types

lib/paperclip/upfile.rb

@@ -8,12 +8,13 @@ module Paperclip
     def content_type
       type = (self.path.match(/\.(\w+)$/)[1] rescue "octet-stream").downcase
       case type
-      when %r"jpe?g"                 then "image/jpeg"
+      when %r"jp(e|g|eg)"            then "image/jpeg"
       when %r"tiff?"                 then "image/tiff"
       when %r"png", "gif", "bmp"     then "image/#{type}"
       when "txt"                     then "text/plain"
       when %r"html?"                 then "text/html"
-      when "csv", "xml", "css", "js" then "text/#{type}"
+      when "js"                      then "application/js"
+      when "csv", "xml", "css"       then "text/#{type}"
       else "application/x-#{type}"
       end
     end

test/upfile_test.rb

+require 'test/helper'
+
+class UpfileTest < Test::Unit::TestCase
+  { %w(jpg jpe jpeg) => 'image/jpeg',
+    %w(tif tiff)     => 'image/tiff',
+    %w(png)          => 'image/png',
+    %w(gif)          => 'image/gif',
+    %w(bmp)          => 'image/bmp',
+    %w(txt)          => 'text/plain',
+    %w(htm html)     => 'text/html',
+    %w(csv)          => 'text/csv',
+    %w(xml)          => 'text/xml',
+    %w(css)          => 'text/css',
+    %w(js)           => 'application/js',
+    %w(foo)          => 'application/x-foo'
+  }.each do |extensions, content_type|
+    extensions.each do |extension|
+      should "return a content_type of #{content_type} for a file with extension .#{extension}" do
+        file = stub('file', :path => "basename.#{extension}")
+        class << file
+          include Paperclip::Upfile
+        end
+
+        assert_equal content_type, file.content_type
+      end
+    end
+  end
+end