Mocking file uploads in Rails 3.1 controller tests

Question

My controller accesses the tempfile attribute of an uploaded file and passes it to another mocked component. My test code has

  @file = mock(Object)         


        

Answer 1

Finally found this, which tells that although the thing returned by fixture_file_upload has a @tempfile member, it lacks the reader method. Solved as follows

  FileUtils.touch('file.zip') # fixture_file_upload needs the file to exist
  @file = fixture_file_upload('file.zip')
  class << @file
    # The reader method is present in a real invocation,
    # but missing from the fixture object for some reason (Rails 3.1.1)
    attr_reader :tempfile
  end