How to iterate through an in-memory zip file in Ruby

Question

I am writing a unit test, and one of them is returning a zip file and I want to check the content of this zip file, grab some values from it, and pass the values to the next tests.

I'm using Rack Test, so I know the content of my zip file is inside last_response.body. I have looked through the documentation of RubyZip but it seems that it's always expecting a file. Since I'm running a unit test, I prefer to have everything done in the memory as not to pollute any folder with test zip files, if possible.

Answer 1

Matt's answer is exactly right. Here it is updated to the new API:

Zip::InputStream.open(StringIO.new(input)) do |io|
  while entry = io.get_next_entry
    if entry.name == 'doc.kml'
      parse_kml(io.read)
    else
      raise "unknown entry in kmz file: #{entry.name}"
    end
  end
end

And there's no need to monkeypatch StringIO anymore. Progress!