使用轨道进行自动测试和Rspec测试

我刚开始使用自动测试。据我所知,我已经配置好了一切,但每次我运行

richards-macbook-pro: $ autotest 
loading autotest/rails
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -I.:lib:test -rubygems -e "%w[test/unit test/unit/link_test.rb test/functional/links_controller_test.rb test/unit/tagging_test.rb test/functional/tag_controller_test.rb test/unit/tag_test.rb].each { |f| require f }" | unit_diff -u
./test/unit/../test_helper.rb:26: undefined method `use_transactional_fixtures=' for Test::Unit::TestCase:Class (NoMethodError)
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
    from ./test/unit/link_test.rb:1
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
    from -e:1
    from -e:1:in `each'
    from -e:1

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我觉得这很奇怪,我刚刚开始使用rspec来测试,而不是传统的rails工具。我试图从我的项目中删除整个测试文件夹(但保留我的规范/文件夹),当我这样做时,自动测试将永远不会完全启动:

richards-macbook-pro: $ autotest 
loading autotest/rails

即使我在spec文件夹中保存了一些东西,它也不会更新。这似乎并不常见,是否有人知道可能的解决方法,或者告诉AutoTest只查看我的/spec文件夹???