[ruby/net-http] Support chunked data and fixed test failure with multipart/form-data

https://github.com/ruby/net-http/commit/b38c2795a9

test/net/http/test_http.rb

@@ -843,6 +843,7 @@ Content-Type: application/octet-stream
 __EOM__
       start {|http|
         _test_set_form_urlencoded(http, data.reject{|k,v|!v.is_a?(String)})
+        @server.mount('/', lambda {|req, res| res.body = req.body })
         _test_set_form_multipart(http, false, data, expected)
         _test_set_form_multipart(http, true, data, expected)
       }
@@ -887,6 +888,7 @@ __EOM__
       expected.sub!(/<filename>/, filename)
       expected.sub!(/<data>/, $test_net_http_data)
       start {|http|
+        @server.mount('/', lambda {|req, res| res.body = req.body })
         data.each{|k,v|v.rewind rescue nil}
         req = Net::HTTP::Post.new('/')
         req.set_form(data, 'multipart/form-data')

test/net/http/utils.rb

@@ -96,8 +96,12 @@ module TestNetHTTPUtils
         @path, @query = parse_path_and_query(path)
         @headers = headers
         @socket = socket
-        if method == 'POST' && @path == '/continue'
-          @body = read_body
+        if method == 'POST' && (@path == '/continue' || @headers['Content-Type'].include?('multipart/form-data'))
+          if @headers['Transfer-Encoding'] == 'chunked'
+            @body = read_chunked_body
+          else
+            @body = read_body
+          end
           @query = @body.split('&').each_with_object({}) do |pair, hash|
             key, value = pair.split('=')
             hash[key] = value
@@ -148,6 +152,15 @@ module TestNetHTTPUtils
         return unless content_length && content_length > 0
         @socket.read(content_length)
       end
+
+      def read_chunked_body
+        body = ""
+        while (chunk_size = @socket.gets.strip.to_i(16)) > 0
+          body << @socket.read(chunk_size)
+          @socket.read(2) # read \r\n after each chunk
+        end
+        body
+      end
     end
 
     class Response