net/ftp.rb: NullSocket#closed?

* net/ftp.rb: add NullSocket#closed? to fix closing not opened
  connection.  [Fix GH-1232]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53810 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/net/ftp/test_ftp.rb b/test/net/ftp/test_ftp.rb
index 3af00e7da9..4759772cb1 100644
--- a/test/net/ftp/test_ftp.rb
+++ b/test/net/ftp/test_ftp.rb
@@ -29,6 +29,14 @@ class FTPTest < Test::Unit::TestCase
     end
   end
 
+  def test_closed_when_not_connected
+    ftp = Net::FTP.new
+    assert_equal(true, ftp.closed?)
+    assert_nothing_raised(Net::FTPConnectionError) do
+      ftp.close
+    end
+  end
+
   def test_connect_fail
     server = create_ftp_server { |sock|
       sock.print("421 Service not available, closing control connection.\r\n")