Added XML::Attribute#text

This allows attributes to also be used for axes such as "=".

lib/oga/xml/attribute.rb

@@ -67,12 +67,16 @@ module Oga
       end
 
       ##
+      # Returns the value of the attribute.
+      #
       # @return [String]
       #
-      def to_s
+      def text
         return value.to_s
       end
 
+      alias_method :to_s, :text
+
       ##
       # @return [String]
       #

spec/oga/xml/attribute_spec.rb

@@ -37,13 +37,13 @@ describe Oga::XML::Attribute do
     end
   end
 
-  context '#to_s' do
+  context '#text' do
     example 'return an empty String when there is no value' do
-      described_class.new.to_s.should == ''
+      described_class.new.text.should == ''
     end
 
     example 'return the value if it is present' do
-      described_class.new(:value => 'a').to_s.should == 'a'
+      described_class.new(:value => 'a').text.should == 'a'
     end
   end
 

spec/oga/xpath/evaluator/operators/eq_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Oga::XPath::Evaluator do
   context 'equal operator' do
     before do
-      @document  = parse('<root><a>10</a><b>10</b></root>')
+      @document  = parse('<root><a>10</a><b class="foo">10</b></root>')
       @evaluator = described_class.new(@document)
     end
 
@@ -54,5 +54,9 @@ describe Oga::XPath::Evaluator do
     example 'return true if a number and a node set wildcard are equal' do
       @evaluator.evaluate('10 = root/*').should == true
     end
+
+    example 'return true if an attribute and string are equal' do
+      @evaluator.evaluate('root/b/@class = "foo"').should == true
+    end
   end
 end