这有效：
[rails31]$ ruby -S rspec ./spec/models/domain_spec.rb
*.
Pending:
Domain add some examples to (or delete) /home/keith/Code/elements2/spec/models/domain_spec.rb
# Not Yet Implemented
# ./spec/models/domain_spec.rb:4
Finished in 0.04241 seconds
2 examples, 0 failures, 1 pending
但是我试图从guard运行，它执行以下命令：
[rails31]$ /home/keith/.rbenv/versions/1.9.2-p290/bin/ruby -S rspec ./spec/models/domain_spec.rb
/home/keith/.rbenv/versions/1.9.2-p290/bin/ruby: no Ruby script found in input (LoadError)
打破这一点足以执行我得到这个：
[rails31]$ /home/keith/.rbenv/versions/1.9.2-p290/bin/ruby ./spec/models/domain_spec.rb
/home/keith/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/rspec-core-2.8.0.rc1/lib/rspec/core/configuration.rb:335:in `rescue in debug=': (RuntimeError)
**************************************************
no such file to load -- ruby-debug
If you have it installed as a ruby gem, then you need to either require
'rubygems' or configure the RUBYOPT environment variable with the value
'rubygems'.
...
这实际上是我首先开始的地方 - 我知道rspec尊重“dont require rubygems”规则，所以也许我需要运行rake。我遇到这个错误的一个大问题是ruby1.9不存在“ruby-debug” - 它应该是ruby-debug19 - 所以这里发生了什么？
所以无论如何，我试过Rake：
[rails31]$ rake spec ./spec/models/domain_spec.rb
(in /home/keith/Code/elements2)
rake aborted!
uninitialized constant Rake::DSL
...
我试过谷歌搜索问题，但没有明显的事情发生，所以我真的很难过
更新：
在阅读this post之后我已经设法解决了佣金问题，但是现在当我运行rake时我得到了这个：
[rails31]$ rake spec
(in /home/keith/Code/elements2)
/home/keith/.rbenv/versions/1.9.2-p290/bin/ruby -S rspec ./spec/models/domain_spec.rb
/home/keith/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/rspec-core-2.8.0.rc1/lib/rspec/core/configuration.rb:335:in `rescue in debug=': (RuntimeError)
...