Rails - Mar 2011 - Need help with RSpec xhr request

I have the following function in JS for a drag and drop file uploader:

function uploadFile(file){


             var xhr = new XMLHttpRequest();
             var upload = xhr.upload;
             var uri     
"/imagebooks/upload_supporting_image/?authenticity_token=" +
$(''meta[name=csrf-token]'').attr("content");

             xhr.open(''POST'', uri, true);
             xhr.setRequestHeader(''X-Filename'',
file.fileName);

             xhr.send(file);


    }

This works properly.  I''m trying to create a spec to test the function
with rspec- anyone know how I can mimic this?  I''ve tried:

before(:each) do
    @image = File.open("#{Rails.root}/public/images/test/test.jpg",
''rb'')

  end

  describe ''Upload Supporting Image method'' do
    it ''should read a binary string and write a file with it''
do
      request.env[''X-Filename''] = ''test.jpg''
      xhr :post, :upload_supporting_image, @image
    end
  end


But it doesn''t work as expected.  Any help is greatly appreciated!

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