Rubyonrails 使用 RSpec on Rails 4 进行防护，发出大量警告

我想知道如何在运行简单测试时关闭所有这些警告:

[1] guard(main)> 
16:59:46 - INFO - Run all
16:59:46 - INFO - Running all specs
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/rspec-rails-3.0.1/lib/rspec/rails/adapters.rb:124: warning: instance variable @example not initialized
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/rspec-rails-3.0.1/lib/rspec/rails/adapters.rb:124: warning: instance variable @example not initialized
.*

Pending:
  HomeHelper add some examples to (or delete) /Users/esjd/ruby/rails/ts3/spec/helpers/home_helper_spec.rb
    # Not yet implemented
    # ./spec/helpers/home_helper_spec.rb:14

Finished in 0.03601 seconds (files took 7 minutes 48 seconds to load)
2 examples, 0 failures, 1 pending
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/celluloid-0.15.2/lib/celluloid/tasks.rb:76: warning: global variable `$CELLULOID_DEBUG' not initialized
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/celluloid-0.15.2/lib/celluloid/tasks.rb:76: warning: global variable `$CELLULOID_DEBUG' not initialized

/Users/esjd/.rvm/gems/ruby-2.1.2/gems/guard-2.6.1/lib/guard/interactor.rb:64: warning: instance variable @enabled not initialized
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/guard-2.6.1/lib/guard/interactor.rb:64: warning: instance variable @enabled not initialized
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/guard-2.6.1/lib/guard/interactor.rb:64: warning: instance variable @enabled not initialized
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/guard-2.6.1/lib/guard/interactor.rb:64: warning: instance variable @enabled not initialized
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/celluloid-0.15.2/lib/celluloid/tasks.rb:76: warning: global variable `$CELLULOID_DEBUG' not initialized
/Users/esjd/.rvm/gems/ruby-2.1.2/gems/celluloid-0.15.2/lib/celluloid/tasks.rb:76: warning: global variable `$CELLULOID_DEBUG' not initialized

我正在运行Rails 4.1.1、Ruby 2.1.2p95和...

guard (2.6.1)
rspec (3.0.0)
guard-rspec (4.2.9)

我试过用以下方法来管理警卫:

guard :rspec, cmd:"ruby -W0 bin/rspec" do

而不是:

guard :rspec, cmd:"spring rspec" do

但它什么也没做.

这些警告非常烦人，我很确定不是我造成的.帮助