[jc@macbookpro ~/Desktop/dm-paperclip]# rake
(in /Users/jc/Desktop/dm-paperclip)
/Users/jc/.rvm/ruby-1.9.1-p243/bin/ruby -I"lib:dm-paperclip" "/Users/jc/.rvm/gems/ruby/1.9.1/gems/rake-0.8.7/lib/rake/rake_test_loader.rb" "test/attachment_test.rb" "test/geometry_test.rb" "test/integration_test.rb" "test/iostream_test.rb" "test/paperclip_test.rb" "test/storage_test.rb" "test/thumbnail_test.rb" 
/Users/jc/.rvm/gems/ruby/1.9.1/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `load': /Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:184: invalid multibyte char (US-ASCII) (SyntaxError)
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:184: syntax error, unexpected $undefined
...ame).returns("sheep_say_b?.png\r\n")
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:185: syntax error, unexpected tIDENTIFIER, expecting keyword_end
      @not_file.expects(:content_type).returns("image/png\r\n")
                                                     ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:185: syntax error, unexpected $undefined, expecting keyword_end
      @not_file.expects(:content_type).returns("image/png\r\n")
                                                          ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:197: syntax error, unexpected tIDENTIFIER, expecting keyword_end
    should "remove strange letters and replace with underscore (_)" do
                  ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:197: syntax error, unexpected tSTRING_BEG, expecting keyword_end
    should "remove strange letters and replace with underscore (_)" do
                                                                   ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:198: syntax error, unexpected tIDENTIFIER, expecting keyword_end
      assert_equal "sheep_say_b_.png", @dummy.avatar.original_filename
                                ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:202: syntax error, unexpected tCONSTANT, expecting keyword_end
  context "An attachment" do
             ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:205: syntax error, unexpected ':', expecting keyword_end
        :path => ":merb_root/tmp/:attachment/:cl...
                   ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:205: syntax error, unexpected tSYMBEG
...t/:class/:style/:id/:basename.:extension"
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:207: syntax error, unexpected tIDENTIFIER, expecting keyword_end
      FileUtils.rm_rf("tmp")
                          ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:213: syntax error, unexpected tIDENTIFIER, expecting keyword_end
                                 "fixtures",
                                          ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:214: syntax error, unexpected tINTEGER, expecting keyword_end
                                 "5k.png"))
                                   ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:217: syntax error, unexpected tIDENTIFIER, expecting keyword_end
    should "raise if there are not the correct...
                 ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:217: syntax error, unexpected tIDENTIFIER, expecting '('
...uld "raise if there are not the correct columns when you try...
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:217: syntax error, unexpected keyword_when, expecting keyword_end
...re not the correct columns when you try to assign" do
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:224: syntax error, unexpected keyword_return, expecting keyword_end
    should "return its default_url when no file assigned" do
                  ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:224: syntax error, unexpected keyword_when, expecting keyword_end
    should "return its default_url when no file assigned" do
                                       ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:226: syntax error, unexpected tSTRING_BEG, expecting keyword_end
      assert_equal "/avatars/original/missing.png", @attachment.url
                                                  ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:227: syntax error, unexpected tSTRING_BEG, expecting keyword_end
      assert_equal "/avatars/blah/missing.png", @attachment.url(:blah)
                                              ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:230: syntax error, unexpected tIDENTIFIER, expecting keyword_end
    context "with a file assigned in the database" do
                 ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:230: syntax error, unexpected keyword_in, expecting keyword_end
    context "with a file assigned in the database" do
                                    ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:233: syntax error, unexpected tIDENTIFIER, expecting keyword_end
...ar_content_type).returns("image/png")
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:233: syntax error, unexpected tSTRING_BEG, expecting keyword_do or '{' or '('
...ntent_type).returns("image/png")
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:240: syntax error, unexpected keyword_return, expecting keyword_end
      should "return a correct url even if the file does not exist" do
                    ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:240: syntax error, unexpected tIDENTIFIER, expecting '('
      should "return a correct url even if the file does not exist" do
                                                                  ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:245: syntax error, unexpected tIDENTIFIER, expecting keyword_end
      should "make sure the updated_at mtime is...
                  ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:245: syntax error, unexpected keyword_in, expecting keyword_end
...sure the updated_at mtime is in the url if it is defined" do
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:249: syntax error, unexpected tIDENTIFIER, expecting keyword_end
      context "with the updated_at field removed" do
                   ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:254: syntax error, unexpected tIDENTIFIER, expecting keyword_end
        should "only return the url without the u...
                    ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:254: void value expression
...        should "only return the url without the updated_at w...
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:254: syntax error, unexpected keyword_when, expecting keyword_end
...url without the updated_at when sent #url" do
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:301: syntax error, unexpected keyword_do_block, expecting keyword_end
              [:large, :medium, :small].each do |style|
                                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:311: syntax error, unexpected keyword_do_block, expecting keyword_end
               [:small, 32, 32, "JPEG"]].each do |style|
                                                ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:328: syntax error, unexpected keyword_do_block, expecting keyword_end
...tachment.styles.keys.collect do |style|
...                               ^
/Users/jc/Desktop/dm-paperclip/test/attachment_test.rb:343: syntax error, unexpected keyword_end, expecting $end
    from /Users/jc/.rvm/gems/ruby/1.9.1/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `block in <main>'
    from /Users/jc/.rvm/gems/ruby/1.9.1/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `each'
    from /Users/jc/.rvm/gems/ruby/1.9.1/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `<main>'
rake aborted!
Command failed with status (1): [/Users/jc/.rvm/ruby-1.9.1-p243/bin/ruby -I...]

(See full trace by running task with --trace)
[jc@macbookpro ~/Desktop/dm-paperclip]# ruby -v
ruby 1.9.1p243 (2009-07-16 revision 24175) [i386-darwin10.0.0]
[jc@macbookpro ~/Desktop/dm-paperclip]# 

using datamapper version 0,10.1

it always complains 'attachment' is not set.