в 'require': нет такого файла для загрузки - spec_helper

Обнаружил эту ошибку при тестировании раздела учебника ruby ​​on rails с помощью rspec на платформе Windows с использованием jruby 1.6:

c:\rails_projects\sample_app>bundle exec rspec spec/
org/jruby/RubyKernel.java:1038:in `require': no such file to load -- spec_helper
 (LoadError)
        from c:/rails_projects/sample_app/spec/controllers/pages_controller_spec    .rb:1:in `(root)'
        from org/jruby/RubyKernel.java:1063:in `load'
        from c:/rails_projects/sample_app/spec/controllers/pages_controller_spec
.rb:386:in `load_spec_files'
        from org/jruby/RubyArray.java:2458:in `collect'
        from c:/jruby-1.6.0.RC2/lib/ruby/gems/1.8/gems/rspec-core-2.5.1/lib/rspe
c/core/configuration.rb:386:in `load_spec_files'
        from c:/jruby-1.6.0.RC2/lib/ruby/gems/1.8/gems/rspec-core-2.5.1/lib/rspe
c/core/command_line.rb:18:in `run'
        from c:/jruby-1.6.0.RC2/lib/ruby/gems/1.8/gems/rspec-core-2.5.1/lib/rspe
c/core/runner.rb:55:in `run_in_process'
        from c:/jruby-1.6.0.RC2/lib/ruby/gems/1.8/gems/rspec-core-2.5.1/lib/rspe
c/core/runner.rb:46:in `run'
        from c:/jruby-1.6.0.RC2/lib/ruby/gems/1.8/gems/rspec-core-2.5.1/lib/rspe
c/core/runner.rb:10:in `autorun'
        from org/jruby/RubyProc.java:268:in `call'
        from org/jruby/RubyProc.java:232:in `call'

Нашел ответ, который отсутствует в учебнике:

c : \ rails_projects \ sample_app> rails generate rspec: install