Support for the XPath comment() test.

spec/oga/xpath/evaluator/type_tests/comment_spec.rb

@@ -0,0 +1,42 @@
+require 'spec_helper'
+
+describe Oga::XPath::Evaluator do
+  context 'comment() tests' do
+    before do
+      @document  = parse('<a><!--foo--><b><!--bar--></b></a>')
+      @evaluator = described_class.new(@document)
+    end
+
+    context 'matching text nodes' do
+      before do
+        @set = @evaluator.evaluate('a/comment()')
+      end
+
+      it_behaves_like :node_set, :length => 1
+
+      example 'return a Comment instance' do
+        @set[0].is_a?(Oga::XML::Comment).should == true
+      end
+
+      example 'return the "foo" comment node' do
+        @set[0].text.should == 'foo'
+      end
+    end
+
+    context 'matching nested text nodes' do
+      before do
+        @set = @evaluator.evaluate('a/b/comment()')
+      end
+
+      it_behaves_like :node_set, :length => 1
+
+      example 'return a Comment instance' do
+        @set[0].is_a?(Oga::XML::Comment).should == true
+      end
+
+      example 'return the "bar" comment node' do
+        @set[0].text.should == 'bar'
+      end
+    end
+  end
+end