Test that a disconnect after the write request but before the data is an error

tests/acceptance/fakes/source/close_after_write.rb

@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+
+# We connect, pause the server, issue a write request, disconnect,
+# then cont the server. This ensures that our disconnect happens
+# while the server is trying to read the write data.
+
+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.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)