[aws|dns] Parse IsTruncated as boolean in list_resource_record_set

Test for proper response format.

lib/fog/aws/parsers/dns/list_resource_record_sets.rb

@@ -38,8 +38,10 @@ module Fog
               case name
               when 'MaxItems'
                 @response[name] = value.to_i
-              when 'IsTruncated', 'NextRecordName', 'NextRecordType'
+              when 'NextRecordName', 'NextRecordType'
                 @response[name] = value
+              when 'IsTruncated'
+                @response[name] = value == 'true'
               end
             end
           end

tests/aws/requests/dns/dns_tests.rb

@@ -224,17 +224,11 @@ Shindo.tests('Fog::DNS[:aws] | DNS requests', ['aws', 'dns']) do
       response.status == 200
     }
 
-    test("list resource records")  {
+    tests("list resource records").formats(AWS::DNS::Formats::LIST_RESOURCE_RECORD_SETS)  {
       pending if Fog.mocking?
 
       # get resource records for zone
-      response = @r53_connection.list_resource_record_sets( @zone_id)
-      if response.status == 200
-        record_sets= response.body['ResourceRecordSets']
-        num_records= record_sets.count
-      end
-
-      response.status == 200
+      @r53_connection.list_resource_record_sets(@zone_id).body
     }
 
     test("delete #{@new_records.count} resource records") {

tests/aws/requests/dns/helper.rb

@@ -0,0 +1,21 @@
+class AWS
+  module DNS
+    module Formats
+      RESOURCE_RECORD_SET = {
+        "ResourceRecords" => Array,
+        "Name" => String,
+        "Type" => String,
+        "AliasTarget"=> Fog::Nullable::Hash,
+        "TTL" => Fog::Nullable::String
+      }
+
+      LIST_RESOURCE_RECORD_SETS = {
+        "ResourceRecordSets" => [RESOURCE_RECORD_SET],
+        "IsTruncated" => Fog::Boolean,
+        "MaxItems" => Integer,
+        "NextRecordName" => Fog::Nullable::String,
+        "NextRecordType" => Fog::Nullable::String
+      }
+    end
+  end
+end