spec_rack_deflater.rb

require 'test/spec'

require 'rack/mock'
require 'rack/deflater'
require 'stringio'

context "Rack::Deflater" do
  def build_response(body, accept_encoding, headers = {})
    app = lambda { |env| [200, {}, body] }
    request = Rack::MockRequest.env_for("", headers.merge("HTTP_ACCEPT_ENCODING" => accept_encoding))
    response = Rack::Deflater.new(app).call(request)

    return response
  end
  
  specify "should be able to deflate bodies that respond to each" do
    body = Object.new
    class << body; def each; yield("foo"); yield("bar"); end; end

    response = build_response(body, "deflate")

    response[0].should.equal(200)
    response[1].should.equal({ "Content-Encoding" => "deflate" })
    response[2].to_s.should.equal("K\313\317OJ,\002\000")
  end

  # TODO: This is really just a special case of the above...
  specify "should be able to deflate String bodies" do
    response = build_response("Hello world!", "deflate")

    response[0].should.equal(200)
    response[1].should.equal({ "Content-Encoding" => "deflate" })
    response[2].to_s.should.equal("\363H\315\311\311W(\317/\312IQ\004\000")
  end
  
  specify "should be able to gzip bodies that respond to each" do
    body = Object.new
    class << body; def each; yield("foo"); yield("bar"); end; end

    response = build_response(body, "gzip")

    response[0].should.equal(200)
    response[1].should.equal({ "Content-Encoding" => "gzip" })

    io = StringIO.new(response[2].to_s)
    gz = Zlib::GzipReader.new(io)
    gz.read.should.equal("foobar")
    gz.close
  end

  specify "should be able to fallback to no deflation" do
    response = build_response("Hello world!", "superzip")

    response[0].should.equal(200)
    response[1].should.equal({})
    response[2].should.equal("Hello world!")
  end

  specify "should handle the lack of an acceptable encoding" do
    response1 = build_response("Hello world!", "identity;q=0", "PATH_INFO" => "/")
    response1[0].should.equal(406)
    response1[1].should.equal({"Content-Type" => "text/plain"})
    response1[2].should.equal("An acceptable encoding for the requested resource / could not be found.")

    response2 = build_response("Hello world!", "identity;q=0", "SCRIPT_NAME" => "/foo", "PATH_INFO" => "/bar")
    response2[0].should.equal(406)
    response2[1].should.equal({"Content-Type" => "text/plain"})
    response2[2].should.equal("An acceptable encoding for the requested resource /foo/bar could not be found.")
  end
end