fix spec a bit for factorization generator

diff --git a/spec/generator/factorization_spec.rb b/spec/generator/factorization_spec.rb
index f3578c8..3bd1107 100644 (file)
--- a/spec/generator/factorization_spec.rb
+++ b/spec/generator/factorization_spec.rb
@@ -6,9 +6,11 @@ module Mint::Generator
 
   describe Factorization do
 
-    context "order 2" do
+    subject { Factorization.new }
+
+    it_should_behave_like 'HighOrderExpression'
 
-      subject{ Factorization.new }
+    context "order 2" do
 
       before do
         options = {