Description: Don't test cyphers that don't have fixtures

Author: David Suárez <david.sephirot@gmail.com>
Last-Update: 2014-10-5

--- a/test/transport/test_packet_stream.rb
+++ b/test/transport/test_packet_stream.rb
@@ -1689,6 +1689,8 @@ module Transport
         next
       end
 
+      next if cipher_name == 'aes256-gcm@openssh.com' or cipher_name == 'aes128-gcm@openssh.com'
+
       # JRuby Zlib implementation (1.4 & 1.5) does not have byte-to-byte compatibility with MRI's.
       # skip these 80 or more tests under JRuby.
       if defined?(JRUBY_VERSION)
