CSS parser tests for paths with namespaces.

spec/oga/css/parser/paths_spec.rb

@@ -6,6 +6,10 @@ describe Oga::CSS::Parser do
       parse_css('foo').should == parse_xpath('descendant::foo')
     end
 
+    example 'parse a path using a namespace' do
+      parse_css('ns|foo').should == parse_xpath('descendant::ns:foo')
+    end
+
     example 'parse a path using two selectors' do
       parse_css('foo bar').should == parse_xpath(
         'descendant::foo/descendant::bar'