fix: #3 handle domains without A-record

If a domain only has an mx record but no A record it
will trigger a ConnectionError when attempting the
nicknym key lookup.

We need to detect and handle this in the http adapter
already because once the exception is handled by Celluloid
our actor will be terminated.

So now we allow for handing a rescue option to the
adapter with a string that is checked for inclusion in
the error message. If the string is found the exception
will be caught and the adapter returns nil.

We only make use of this when checking the availability
of nicknym so far. That should be the only http request
going out.

1 files changed, 13 insertions, 2 deletions

diff --git a/test/remote/nicknym_source_test.rb b/test/remote/nicknym_source_test.rb
index 4ca3033..b97f2b2 100644
--- a/test/remote/nicknym_source_test.rb
+++ b/test/remote/nicknym_source_test.rb
@@ -10,13 +10,24 @@ require 'nickserver/email_address'
 class RemoteNicknymSourceTest < CelluloidTest
   include HttpAdapterHelper
 
-  def test_availablility_check
+  def test_available_for_mail
     source.available_for? 'mail.bitmask.net'
-    refute source.available_for? 'dl.bitmask.net'   # not a provider
   rescue HTTP::ConnectionError => e
     skip e.to_s
   end
 
+  # not a provider
+  def test_not_available
+    refute source.available_for? 'dl.bitmask.net'
+  rescue HTTP::ConnectionError => e
+    skip e.to_s
+  end
+
+  # cs.ucl.ac.uk only has an MX not an A-record
+  def test_not_available_without_a_record
+    refute source.available_for? 'cs.ucl.ac.uk'
+  end
+
   def test_successful_query
     response = source.query(email_with_key)
     skip if response.status == 404