allow error from RDF::Graph to be parsed with or without paren around…

… code

process ioerror_code from RDF::Graph.load whether the code is
* in parentheses (i.e. "... (404)")
* or not (i.e. "... 404")

app/services/qa/linked_data/graph_service.rb

@@ -106,12 +106,10 @@ def process_error(e, url)
             end
           end
 
+          # process ioerror_code from RDF::Graph.load whether the code is in parentheses (i.e. "... (404)"), or not (i.e. "... 404")
           def ioerror_code(e)
             msg = e.message
-            return 'format' if msg.start_with? "Unknown RDF format"
-            a = msg.size - 4
-            z = msg.size - 2
-            msg[a..z]
+            msg[/(\(?)(\d\d\d)(\)?)$/, 2]
           end
       end
     end

spec/services/linked_data/graph_service_spec.rb

@@ -66,6 +66,7 @@
       subject { described_class.load_graph(url: url) }
 
       let(:url) { 'http://experimental.worldcat.org/fast/search?maximumRecords=3&query=cql.any%20all%20%22cornell%22&sortKeys=usage' }
+      let(:regurl) { 'http:\/\/experimental.worldcat.org\/fast\/search\?maximumRecords=3&query=cql.any%20all%20%22cornell%22&sortKeys=usage' }
       let(:uri) { URI(url) }
 
       before do
@@ -74,7 +75,7 @@
       end
 
       it 'raises error' do
-        expect { subject }.to raise_error(Qa::ServiceError, "Unknown error for #{uri.hostname} on port #{uri.port}.  Try again later. (Cause - <#{url}>: (504))")
+        expect { subject }.to raise_error(Qa::ServiceError, /Unknown error for #{uri.hostname} on port #{uri.port}.  Try again later. \(Cause - <#{regurl}>: \(?504\)?\)/)
       end
     end
   end