ListenAddress should exist (#165)

* ListenAddress should exist

There can be multiple ListenAddress (for instance ipv6 and ipv4 failover).

Signed-off-by: Michée Lengronne <michee.lengronne@coppint.com>

* ListenAddress should be set

Signed-off-by: Michée Lengronne <michee.lengronne@coppint.com>

* test for more nil variants

Signed-off-by: Michée Lengronne <michee.lengronne@coppint.com>

* fix

Signed-off-by: Michée Lengronne <michee.lengronne@coppint.com>

Author: micheelengronne

controls/sshd_spec.rb

@@ -140,7 +140,9 @@
   title 'Server: Specify ListenAddress'
   desc "Limit the SSH server to listen to a specific address. Don't let it listen on all interfaces to avoid logins from unexpected sources."
   describe sshd_config(sshd_custom_path + '/sshd_config') do
-    its('ListenAddress') { should match(/.*/) }
+    its('ListenAddress') { should_not eq nil }
+    its('ListenAddress') { should_not match(/^\s*$/) }
+    its('ListenAddress') { should_not eq [] }
   end
 end