Test that timing out a write causes a disconnect and a reconnect

tests/fakes/dest/hang_after_write.rb

@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+
+# Open a socket, say hello, receive a write, then sleep for > 6
+# seconds. This should tell the source that the write has gone MIA,
+# and we expect a reconnect.
+
+require 'flexnbd/fake_dest'
+include FlexNBD::FakeDest
+
+sock = serve( *ARGV )
+client_sock1 = accept( sock )
+write_hello( client_sock1 )
+read_request( client_sock1 )
+
+t = Thread.start do
+  client_sock2 = accept( sock, "Timed out waiting for a reconnection",
+                        FlexNBD::MS_REQUEST_LIMIT_SECS + 1 )
+  client_sock2.close
+end
+
+sleep( FlexNBD::MS_REQUEST_LIMIT_SECS + 2 )
+client_sock1.close
+
+t.join
+
+exit(0)