ruby-on-rails – Rail3 rake测试任务未运行测试

从我的application.rb：

require File.expand_path('../boot',__FILE__)

# Pick the frameworks you want:                                                                                                                                
require 'action_controller/railtie'
require 'dm-rails/railtie'
# require 'action_mailer/railtie'                                                                                                                              
# require 'active_resource/railtie'                                                                                                                            
require 'rails/test_unit/railtie'

# If you have a Gemfile,require the gems listed there,including any gems                                                                                     
# you've limited to :test,:development,or :production.                                                                                                       
Bundler.require(:default,Rails.env) if defined?(Bundler)

你会注意到我正在使用DataMapper并使用dm-rails bootstrap初始化我的项目.我可以手动运行我的测试,如下所示：

$ruby -Itest test/unit/test_habit.rb 
Loaded suite test/unit/test_habit
Started
.....
Finished in 2.554523 seconds.

5 tests,7 assertions,0 failures,0 errors,0 skips

Test run options: --seed 15947

但是在执行rake测试任务时,没有运行测试,如下所示：

$rake test --trace
(in /home/blt/Documents/projects/rails3apps/naughtyapp)
** Invoke test (first_time)
** Execute test
** Invoke test:units (first_time)
** Invoke test:prepare (first_time)
** Execute test:prepare
** Execute test:units
** Invoke test:functionals (first_time)
** Invoke test:prepare 
** Execute test:functionals
** Invoke test:integration (first_time)
** Invoke test:prepare 
** Execute test:integration

每个运行’first_time’显示在括号中.我的测试没有运行,我必须做错什么？