Rails - Sep 2006 - Lost default value of timestamp field.

I''m using postgresql, I found some problems when running unittest.

file: db/migrate/001_create_post.rb:
--------------------------------------------------------
class CreatePosts < ActiveRecord::Migration
  def self.up
    execute <<-EOS
      create table posts (
        id      serial not null primary key,
        title   varchar(255),
        created_at timestamp not null default current_timestamp
      );
    EOS
  end

  def self.down
    drop_table :posts
  end
end
--------------------------------------------------------

when execute "rake migrate", no problem.

but execute "rake db:test:prepare", the default value "default
current_timestamp" not apply to field "created_at".

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