Fixed an error where ImageMagick wasn't identifying images because the Tempfiles…

Fixed an error where ImageMagick wasn't identifying images because the Tempfiles did not have the right extension.

lib/paperclip/iostream.rb

@@ -4,7 +4,8 @@ module IOStream
 
   # Returns a Tempfile containing the contents of the readable object.
   def to_tempfile
-    tempfile = Tempfile.new("stream")
+    name = respond_to?(:original_filename) ? original_filename : (respond_to?(:path) ? path : "stream")
+    tempfile = Paperclip::Tempfile.new(File.basename(name))
     tempfile.binmode
     self.stream_to(tempfile)
   end

test/attachment_test.rb

@@ -133,7 +133,7 @@ class AttachmentTest < Test::Unit::TestCase
                                :styles => { :default => ["100x100", :png] },
                                :default_style => :default
       @file = StringIO.new("...")
-      @file.expects(:original_filename).returns("file.jpg")
+      @file.stubs(:original_filename).returns("file.jpg")
     end
     should "return the right extension for the path" do
       @attachment.assign(@file)

test/helper.rb

@@ -3,7 +3,7 @@ require 'test/unit'
 require 'shoulda'
 require 'tempfile'
 
-gem 'jferris-mocha', '0.9.5.0.1241126838'
+gem 'jferris-mocha'
 require 'mocha'
 
 gem 'sqlite3-ruby'

test/iostream_test.rb

@@ -58,8 +58,15 @@ class IOStreamTest < Test::Unit::TestCase
         assert @tempfile = @file.to_tempfile
       end
 
-      should "convert it to a Tempfile" do
-        assert @tempfile.is_a?(Tempfile)
+      should "convert it to a Paperclip Tempfile" do
+        assert @tempfile.is_a?(Paperclip::Tempfile)
+      end
+
+      should "have the name be based on the original_filename" do
+        name = File.basename(@file.path)
+        extension = File.extname(name)
+        basename = File.basename(name, extension)
+        assert_match %r[^#{Regexp.quote(basename)}.*?#{Regexp.quote(extension)}], File.basename(@tempfile.path)
       end
 
       should "have the Tempfile contain the same data as the file" do