patch for test_io.rb

gistfile1.txt

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index fba0800..4521a90 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -621,9 +621,10 @@ class TestIO < Test::Unit::TestCase
               nr.times do
                 assert_equal megacontent.bytesize, IO.copy_stream("megasrc", s1
)
               end
+              sleep 0.5
               assert_equal(1, @usr1_rcvd)
-              s1.close
             ensure
+              s1.close
               _, status = Process.waitpid2(pid) if pid
             end
             assert status.success?, status.inspect