Add more debug info

closed server doesn't have useful info.
So call inspect before close.
And add local debug code in comment.

https://rubyci.org/logs/rubyci.s3.amazonaws.com/unstable11x/ruby-master/log/20191215T092405Z.fail.html.gz
```
  1) Failure:
IMAPTest#test_connection_closed_without_greeting [/export/home/rubyci/chkbuild-tmp/tmp/build/20191215T092405Z/ruby/test/net/imap/test_imap.rb:483]:
[Net::IMAP::Error] exception expected, not #<RuntimeError: {:e=>#<Errno::EINVAL: Invalid argument - connect(2) for [::1]:41748>, :server=>#<TCPServer:(closed)>, :port=>41748, :server_addr=>"::1"}>.
```

1 files changed, 8 insertions, 1 deletions

diff --git a/test/net/imap/test_imap.rb b/test/net/imap/test_imap.rb
index 850974fa1a..33b305e116 100644
--- a/test/net/imap/test_imap.rb
+++ b/test/net/imap/test_imap.rb
@@ -472,18 +472,25 @@ class IMAPTest < Test::Unit::TestCase
   def test_connection_closed_without_greeting
     server = create_tcp_server
     port = server.addr[1]
+    h = {'server before close': server.inspect} # inspect info before close
     start_server do
       begin
         sock = server.accept
+        h[:sock_addr], h[:sock_peeraddr] = sock.addr, sock.peeraddr
         sock.close
       ensure
         server.close
       end
     end
     assert_raise(Net::IMAP::Error) do
+      #begin
       Net::IMAP.new(server_addr, :port => port)
+      #rescue Net::IMAP::Error
+      #  raise Errno::EINVAL
+      #end
     rescue Errno::EINVAL => e # for debug on OpenCSW
-      raise({e: e, server: server, port: port, server_addr: server_addr}.inspect)
+      h.merge!({e: e, server: server, port: port, server_addr: server_addr})
+      raise(h.inspect)
     end
   end