Corrected XPath attribute axis specs.

spec/oga/xpath/evaluator/axes/attribute_spec.rb

@@ -3,11 +3,11 @@ require 'spec_helper'
 describe Oga::XPath::Evaluator do
   context 'attribute axis' do
     before do
-      document   = parse('<a foo="bar"><b x="y"></b></a>')
-      @evaluator = described_class.new(document)
+      document   = parse('<a foo="bar"></a>')
+      @evaluator = described_class.new(document.children[0])
     end
 
-    context 'top-level attributes' do
+    context 'element attributes' do
       before do
         @set = @evaluator.evaluate('attribute::foo')
       end
@@ -23,22 +23,6 @@ describe Oga::XPath::Evaluator do
       end
     end
 
-    context 'nested attributes' do
-      before do
-        @set = @evaluator.evaluate('/a/attribute::x')
-      end
-
-      it_behaves_like :node_set, :length => 1
-
-      example 'return an Attribute instance' do
-        @set[0].is_a?(Oga::XML::Attribute).should == true
-      end
-
-      example 'return the correct attribute' do
-        @set[0].name.should == 'x'
-      end
-    end
-
     context 'non existing attributes' do
       before do
         @set = @evaluator.evaluate('attribute::bar')