Introduced StockChange. Implemented first part of stockit-logic with updating article's quantity.

test/fixtures/articles.yml

@@ -1,5 +1,5 @@
 # == Schema Information
-# Schema version: 20090115123421
+# Schema version: 20090115232435
 #
 # Table name: articles
 #

test/fixtures/messages.yml

@@ -1,11 +1,11 @@
 # == Schema Information
-# Schema version: 20090115123421
+# Schema version: 20090115232435
 #
 # Table name: messages
 #
 #  id             :integer(4)      not null, primary key
 #  sender_id      :integer(4)
-#  recipients_ids :text            default(""), not null
+#  recipients_ids :text
 #  subject        :string(255)     not null
 #  body           :text
 #  email_state    :integer(4)      default(0), not null

test/fixtures/stock_changes.yml

@@ -0,0 +1,28 @@
+# == Schema Information
+# Schema version: 20090115232435
+#
+# Table name: stock_changes
+#
+#  id          :integer(4)      not null, primary key
+#  delivery_id :integer(4)
+#  order_id    :integer(4)
+#  article_id  :integer(4)
+#  quantity    :decimal(6, 2)   default(0.0)
+#  created_at  :datetime
+#
+
+# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
+
+one:
+  delivery: 
+  order: 
+  article: 
+  quantity: 1
+  created_at: 2009-01-16 00:24:35
+
+two:
+  delivery: 
+  order: 
+  article: 
+  quantity: 1
+  created_at: 2009-01-16 00:24:35

test/fixtures/suppliers.yml

@@ -1,5 +1,5 @@
 # == Schema Information
-# Schema version: 20090115123421
+# Schema version: 20090115232435
 #
 # Table name: suppliers
 #

test/unit/stock_change_test.rb

@@ -0,0 +1,8 @@
+require 'test_helper'
+
+class StockChangeTest < ActiveSupport::TestCase
+  # Replace this with your real tests.
+  test "the truth" do
+    assert true
+  end
+end