diff --git a/spec/oga/xpath/evaluator/axes_spec.rb b/spec/oga/xpath/evaluator/axes_spec.rb
index 8799462..5b0f2d1 100644
--- a/spec/oga/xpath/evaluator/axes_spec.rb
+++ b/spec/oga/xpath/evaluator/axes_spec.rb
@@ -3,12 +3,12 @@ require 'spec_helper'
 describe Oga::XPath::Evaluator do
   before do
     @document = parse('<a><b><c></c></b><d></d></a>')
+    @c_node   = @document.children[0].children[0].children[0]
   end
 
   context 'ancestor axis' do
     before do
-      c_node     = @document.children[0].children[0].children[0]
-      @evaluator = described_class.new(c_node)
+      @evaluator = described_class.new(@c_node)
     end
 
     context 'direct ancestors' do
@@ -16,13 +16,7 @@ describe Oga::XPath::Evaluator do
         @set = @evaluator.evaluate('ancestor::b')
       end
 
-      example 'return a NodeSet instance' do
-        @set.is_a?(Oga::XML::NodeSet).should == true
-      end
-
-      example 'return the right amount of rows' do
-        @set.length.should == 1
-      end
+      it_behaves_like :node_set, :length => 1
 
       example 'return the <b> ancestor' do
         @set[0].name.should == 'b'
@@ -34,13 +28,7 @@ describe Oga::XPath::Evaluator do
         @set = @evaluator.evaluate('ancestor::a')
       end
 
-      example 'return a NodeSet instance' do
-        @set.is_a?(Oga::XML::NodeSet).should == true
-      end
-
-      example 'return the right amount of rows' do
-        @set.length.should == 1
-      end
+      it_behaves_like :node_set, :length => 1
 
       example 'return the <b> ancestor' do
         @set[0].name.should == 'a'