Refactor palindromic shared context to work with rspec2.3

Make a temporary, more focused 'palindromic2' tag (@todo temporary)
(26 examples, 0 failures) (Run filtered using {:palindromic2=>true})

@smell is it clear enough what is going on? can it be cleaned up?

spec/runtime/interval_skip_list/palindromic_fixture.rb

@@ -1,23 +1,39 @@
-shared_examples_for "the palindromic fixture" do
-  attr_reader :list, :node
+module PalindromicFixtureSharedContext
+  extend RSpec::Core::SharedContext
   include IntervalSkipListSpecHelper
 
-  before do
+  attr_reader :list, :node
+
+  def construct_interval_skip_list
     @list = IntervalSkipList.new
   end
 
-  it_should_behave_like "#next_node_height is deterministic"
   def expected_node_heights
     [3, 2, 1, 3, 1, 2, 3]
   end
 
-  before do
-    list.insert(1..3, :a)
-    list.insert(1..5, :b)
-    list.insert(1..7, :c)
-    list.insert(1..9, :d)
-    list.insert(1..11, :e)
-    list.insert(1..13, :f)
-    list.insert(5..13, :g)
+  def populate_interval_skip_list
+    @list.insert(1..3, :a)
+    @list.insert(1..5, :b)
+    @list.insert(1..7, :c)
+    @list.insert(1..9, :d)
+    @list.insert(1..11, :e)
+    @list.insert(1..13, :f)
+    @list.insert(5..13, :g)
+  end
+
+  def make_it_determinisitic
+    extend NextNodeHeightIsDeterministicSharedContext # use the method without getting the filter
+    next_node_height_is_deterministic
+  end
+
+  before :each do
+    construct_interval_skip_list
+    make_it_determinisitic
+    populate_interval_skip_list
   end
-end
+end
+
+shared_examples_for "the palindromic fixture" do
+  # @todo needs cleanup!
+end

spec/runtime/interval_skip_list/palindromic_fixture_spec.rb

@@ -1,7 +1,8 @@
 require 'runtime/interval_skip_list/spec_helper'
 
-describe "The palindromic fixture", :palindromic => true do
+describe "The palindromic fixture", :palindromic2 => true do
   it_should_behave_like "the palindromic fixture"
+  include PalindromicFixtureSharedContext
 
   describe " #nodes" do
     describe "[0]" do