merb_multipart_post_test.rb

# If model Thing has fields name, description and photo ...

require File.join(File.dirname(__FILE__), '..', 'spec_helper.rb')

describe "resource(:things)" do
  describe "a successful POST" do

    before(:each) do
      Thing.all.destroy!
      file   = File.new(File.join('path_to_test_photos',"thing_photo.jpg"))
      params = {:name => 'foo', :description => 'cute AND testable', :photo => file}
      @response = multipart_post(resource(:things), {:thing => params})
    end

    it "redirects to resource(:foos)" do
      @response.should redirect_to(resource(Thing.first), :message => {:notice => "thing was successfully created"})
    end

  end
end