manifest: fix attribution

lib/docs/core/doc.rb

@@ -88,7 +88,7 @@ module Docs
 
       def as_json_extra(store)
         json = self.as_json
-        json[:attribution] = options[:attribution].strip if self.class.method_defined?(:options) and options[:attribution].present?
+        json[:attribution] = options[:attribution].strip
         json[:db_size] = store.size(self.db_path) if store.exist?(self.db_path)
         json[:mtime] = store.mtime(self.meta_path).to_i if store.exist?(self.meta_path)
         json

test/lib/docs/core/manifest_test.rb

@@ -3,8 +3,9 @@ require 'docs'
 
 class ManifestTest < MiniTest::Spec
   let :doc do
-    doc = Class.new Docs::Doc
+    doc = Class.new Docs::Scraper
     doc.name = 'TestDoc'
+    doc.options[:attribution] = 'foo'
     doc
   end
 
@@ -63,7 +64,7 @@ class ManifestTest < MiniTest::Spec
       it "includes the doc's meta representation" do
         json = manifest.as_json
         assert_equal 1, json.length
-        assert_equal "{:name=>\"TestDoc\", :slug=>\"testdoc\", :type=>nil, :mtime=>0}", json[0].to_s
+        assert_equal "{:name=>\"TestDoc\", :slug=>\"testdoc\", :type=>nil, :attribution=>\"foo\", :mtime=>0}", json[0].to_s
       end
     end