LoadError when write sinatra helpers using bundler -


follow sinatra write extension document, write ./lib/sinatra/test_helper.rb file containing testhelper, using rackup start got error:

/...path.../vendor/cache/ruby/1.9.1/gems/backports-3.1.1/lib/backports/tools.rb:328:in `require': cannot load such file -- sinatra/testhelper (loaderror)

seems bundler find custom helpers extension. how declare in gemfile?


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