basic specs for ProductIdentifier class

data/product_identifier.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ProductIdentifier>
+  <ProductIDType>02</ProductIDType>
+  <IDValue>0858198363</IDValue>
+</ProductIdentifier>

lib/onix/product_identifier.rb

@@ -2,7 +2,9 @@ module ONIX
   class ProductIdentifier
     include ROXML
 
-    xml_accessor :product_id_type, :from => "ProductIDType", :as => Fixnum # should be a 2 digit num
+    xml_name "ProductIdentifier"
+
+    xml_accessor :product_id_type, :from => "ProductIDType", :as => Fixnum, :to_xml => ONIX::Formatters.two_digit
     xml_accessor :id_value, :from => "IDValue"
   end
 end

spec/product_identifier_spec.rb

@@ -0,0 +1,40 @@
+# coding: utf-8
+
+$LOAD_PATH.unshift(File.dirname(__FILE__) + '/../lib')
+
+require 'onix'
+
+context "ONIX::ProductIdentifier" do
+
+  before(:each) do
+    data_path = File.join(File.dirname(__FILE__),"..","data")
+    file1    = File.join(data_path, "product_identifier.xml")
+    @doc = LibXML::XML::Document.file(file1)
+    @root = @doc.root
+  end
+
+  specify "should correctly convert to a string" do
+    id = ONIX::ProductIdentifier.from_xml(@root.to_s)
+    id.to_xml.to_s[0,19].should eql("<ProductIdentifier>")
+  end
+
+  specify "should provide read access to first level attibutes" do
+    id = ONIX::ProductIdentifier.from_xml(@root.to_s)
+
+    id.product_id_type.should eql(2)
+    id.id_value.should eql("0858198363")
+  end
+
+  specify "should provide write access to first level attibutes" do
+    id = ONIX::ProductIdentifier.new
+
+    id.product_id_type = 2
+    id.to_xml.to_s.include?("<ProductIDType>02</ProductIDType>").should be_true
+
+    id.id_value = "James"
+    id.to_xml.to_s.include?("<IDValue>James</IDValue>").should be_true
+
+  end
+
+end
+