* Denormalized post versions. Testing has shown it reduces the size

of the table 66%.

test/unit/post_history_test.rb

@@ -0,0 +1,33 @@
+require_relative '../test_helper'
+
+class PostHistoryTest < ActiveSupport::TestCase
+  context "A post" do
+    setup do
+      @user = Factory.create(:user)
+      CurrentUser.user = @user
+      CurrentUser.ip_addr = "127.0.0.1"
+      MEMCACHE.flush_all
+    end
+    
+    teardown do
+      CurrentUser.user = nil
+      CurrentUser.ip_addr = nil
+    end
+
+    should "create a revision after creation" do
+      PostHistory.stubs(:revision_time).returns("TIME")
+      post = Factory.create(:post, :tag_string => "aaa bbb ccc")
+      assert_equal(1, post.revisions.size)
+      assert_equal({"source"=>nil, "rating"=>"q", "tag_string"=>"aaa bbb ccc", "parent_id"=>nil, "user_id"=>1, "ip_addr"=>"127.0.0.1", "updated_at"=>"TIME"}, post.revisions.last)
+    end
+
+    should "create additional revisions after updating" do
+      PostHistory.stubs(:revision_time).returns("TIME")
+      post = Factory.create(:post, :tag_string => "aaa bbb ccc")
+      post.update_attributes(:tag_string => "bbb ccc ddd")
+      post.reload
+      assert_equal(2, post.revisions.size)
+      assert_equal({"source"=>nil, "rating"=>"q", "tag_string"=>"bbb ccc ddd", "parent_id"=>nil, "user_id"=>3, "ip_addr"=>"127.0.0.1", "updated_at"=>"TIME"}, post.revisions.last)
+    end
+  end
+end