Failing CSS evaluation specs for the axes.

These currently fail due to the ~ and + axes not being evaluated properly.

spec/oga/css/evaluator/axes_spec.rb

@@ -0,0 +1,67 @@
+require 'spec_helper'
+
+describe 'CSS selector evaluation' do
+  context 'axes' do
+    context '> axis' do
+      before do
+        @document = parse('<root><a><a /></a></root>')
+
+        @a1 = @document.children[0].children[0]
+      end
+
+      example 'return a node set containing direct child nodes' do
+        evaluate_css(@document, 'root > a').should == node_set(@a1)
+      end
+
+      example 'return a node set containing direct child nodes relative to a node' do
+        evaluate_css(@a1, '> a').should == @a1.children
+      end
+
+      example 'return an empty node set for non matching child nodes' do
+        evaluate_css(@document, '> a').should == node_set
+      end
+    end
+
+    context '+ axis' do
+      before do
+        @document = parse('<root><a /><b /><b /></root>')
+
+        @b1 = @document.children[0].children[1]
+        @b2 = @document.children[0].children[2]
+      end
+
+      example 'return a node set containing following siblings' do
+        evaluate_css(@document, 'root a + b').should == node_set(@b1)
+      end
+
+      example 'return a node set containing following siblings relatie to a node' do
+        evaluate_css(@b1, '+ b').should == node_set(@b2)
+      end
+
+      example 'return an empty node set for non matching following siblings' do
+        evaluate_css(@document, 'root a + c').should == node_set
+      end
+    end
+
+    context '~ axis' do
+      before do
+        @document = parse('<root><a /><b /><b /></root>')
+
+        @b1 = @document.children[0].children[1]
+        @b2 = @document.children[0].children[2]
+      end
+
+      example 'return a node set containing following siblings' do
+        evaluate_css(@document, 'root a ~ b').should == node_set(@b1, @b2)
+      end
+
+      example 'return a node set containing following siblings relative to a node' do
+        evaluate_css(@b1, '~ b').should == node_set(@b2)
+      end
+
+      example 'return an empty node set for non matching following siblings' do
+        evaluate_css(@document, 'root a ~ c').should == node_set
+      end
+    end
+  end
+end