Test that closing the socket immediately after sending write data causes an error

tests/acceptance/fakes/source/close_after_write_data.rb

@@ -0,0 +1,33 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+
+# We connect, pause the server, issue a write request, send data,
+# disconnect, then cont the server. This ensures that our disconnect
+# happens before the server can try to write the reply.
+
+require 'flexnbd/fake_source'
+include FlexNBD
+
+addr, port, srv_pid = *ARGV
+
+client = FakeSource.new( addr, port, "Timed out connecting" )
+client.read_hello
+
+Process.kill( "STOP", srv_pid.to_i )
+
+client.write_write_request( 0, 8 )
+client.write_data( "12345678" )
+client.close
+
+Process.kill( "CONT", srv_pid.to_i )
+
+# This sleep ensures that we don't return control to the test runner
+# too soon, giving the flexnbd process time to fall over if it's going
+# to.
+sleep(0.25)
+
+# ...and can we reconnect?
+client2 = FakeSource.new( addr, port, "Timed out connecting" )
+client2.close
+
+exit(0)