rspec users - Dec 2006 - Another RSpec on Rails issue: how to test send_file()

Hi!

Today I needed to implement some controller code, that uses send_file()
to send image data. How can this be tested / specified with RSpec?

bye,

Tobias

Well, here''s one I just dealt with. The spec might not be great, but  
here it is:

# in spec_helper.rb (this code is taken pretty much intact from the  
Wiki article on testing uploads

       # get us an object that represents an uploaded file
       def uploaded_file(path, content_type="application/octet- 
stream", filename=nil)
         filename ||= File.basename(path)
         t = Tempfile.new(filename)
         FileUtils.copy_file(path, t.path)
         (class << t; self; end;).class_eval do
           alias local_path path
           define_method(:original_filename) { filename }
           define_method(:content_type) { content_type }
         end
         return t
       end

       # a JPEG helper
       def uploaded_jpeg(path, filename=nil)
         uploaded_file(path, ''image/jpeg'', filename)
       end

       # a GIF helper
       def uploaded_gif(path, filename=nil)
         uploaded_file(path, ''image/gif'', filename)
       end

       # a CSV helper
       def uploaded_csv(path, filename=nil)
         uploaded_file(path, ''text/csv'', filename)
       end

# in your spec

     setup do
         get_logged_in
         @upload_file = uploaded_csv("#{File.expand_path(RAILS_ROOT)}/ 
spec/fixtures/upload_test.csv")
         @upload_record_count = File.open("#{File.expand_path 
(RAILS_ROOT)}/spec/fixtures/upload_test.csv").readlines("\r").size
- 1
         @original_size = Member.count
     end

     specify "the upload method should receive a good file" do
         @upload_file = uploaded_csv("#{File.expand_path(RAILS_ROOT)}/ 
spec/fixtures/upload_test.csv")
         post :upload, :member_file => @upload_file
         response.should_be_success
         Member.count.should == @original_size + @upload_record_count
         m = Member.find_by_first_and_last(''Blake'',
''Park'')
         m.should_not_be_nil
         m.created_on.year.should_be > 2000
     end

     specify "the upload method should reject bogus data in a file" do
         @upload_file = uploaded_csv("#{File.expand_path(RAILS_ROOT)}/ 
spec/fixtures/upload_bogus_test.csv")
         post :upload, :member_file => @upload_file
         response.should_be_success
         response.should_have_tag :p, :content => /upload data error/
     end


Comments welcomed.

Steve

On Dec 30, 2006, at 3:00 PM, Tobias Grimm wrote:
> Hi!
>
> Today I needed to implement some controller code, that uses  
> send_file()
> to send image data. How can this be tested / specified with RSpec?
>
> bye,
>
> Tobias
> _______________________________________________
> rspec-users mailing list
> rspec-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/rspec-users

s.ross wrote:
> Well, here''s one I just dealt with. The spec might not be great,
but
> here it is:
>   
This is kinda different from what I want to do. My controller looks like
this:

...
def images
  image_file_name = get_image_file_name_by_id(params[:id])
  send_file(image_file_name, :type => ''image/png'',
:disposition => ''inline'')
end
..

I can test with response.should_be_success that this request works.

setup do
  get(:images, :id => ''test-image'')
end

spec "should be successful" do
  response.should_be_success
end

spec "should return mime type image/png''
  # dont know how to test this
end

spec "image data should be inline''
  # dont know how to test this
end

spec "should return the content of the image file"
  # test-images simply contains "dummy-data" - but how do I check
this?
end

But I don''t know how to check, if the content sent to the client with
send_file is correct. During running the spec, the image file is a
simple text file - But how do I get access to the content, the mime
header and the content disposition field to check if these are correct?

Tobias