application.rb

    config.generators do |g|
      g.template_engine :haml
      g.test_framework :rspec, :fixture => true, :views => false
      g.fixture_replacement :factory_girl, :dir => "spec/factories"
    end

Gemfile

source 'http://rubygems.org'

gem 'rails', '3.0.0'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

gem 'mongoid', '2.0.0.beta.17'
gem 'bson_ext', '1.0.4'

gem 'haml'
gem 'paperclip', '2.3.3'

group :development do
  gem 'rails3-generators'
  gem 'haml-rails'
  gem 'jquery-rails'
end

group :test do
  gem 'rspec', '>=2.0.0.beta.22'
  gem 'rspec-rails', '>=2.0.0.beta.22'
  gem 'factory_girl_rails'
  gem 'remarkable_mongoid'
end

spec_helper.rb

# This file is copied to spec/ when you run 'rails generate rspec:install'
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'
require 'factory_girl'
require 'remarkable/mongoid'

# Requires supporting ruby files with custom matchers and macros, etc,
# in spec/support/ and its subdirectories.
Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}
Dir[Rails.root.join("spec/factories/**/*.rb")].each {|f| require f}

RSpec.configure do |config|
  # == Mock Framework
  #
  # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
  #
  # config.mock_with :mocha
  # config.mock_with :flexmock
  # config.mock_with :rr
  config.mock_with :rspec

  # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
  #config.fixture_path = "#{::Rails.root}/spec/fixtures"

  # If you're not using ActiveRecord, or you'd prefer not to run each of your
  # examples within a transaction, remove the following line or assign false
  # instead of true.
  #config.use_transactional_fixtures = false
  
  config.before :each do
    Mongoid.master.collections.select {|c| c.name !~ /system/ }.each(&:drop)
  end
end