He encontrado que no tengo problemas usandorequire para cargar algo como el framework web Sinatra, pero parece que no puedo usarrequire ¿Para cargar mi propio código personalizado?

Por ejemplo tengo dos archivos:

test1.rbtest2.rb

El contenido de 'test1.rb' es:

#!/usr/bin/env ruby
require 'test2'

El contenido de 'test2.rb' es:

class String
    def vowels
        self.scan(/[aeiou]/i)
    end
end

Y si intento correrruby test1.rb Entonces me sale el siguiente error ...

/Users/<username>/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- test2 (LoadError)
    from /Users/<username>/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from test1.rb:3:in `<main>'

Entonces me di cuenta si intentaba usar elshotgun gema para cargar el servidor web y luego obtengo un seguimiento de pila diferente pero más detallado del error ...

Boot Error
Something went wrong while loading test1.rb
LoadError: cannot load such file -- test2

/Users/<username>/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/<username>/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/<username>/Dropbox/Library/Ruby/Passage/test1.rb:3:in `<top (required)>'
/Users/<username>/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/<username>/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:114:in `inner_app'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:102:in `assemble_app'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:86:in `proceed_as_child'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:31:in `call!'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:18:in `call'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/favicon.rb:12:in `call'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/static.rb:14:in `call'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/builder.rb:134:in `call'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.3.1/lib/thin/connection.rb:80:in `block in pre_process'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.3.1/lib/thin/connection.rb:78:in `catch'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.3.1/lib/thin/connection.rb:78:in `pre_process'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.3.1/lib/thin/connection.rb:53:in `process'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.3.1/lib/thin/connection.rb:38:in `receive_data'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.3.1/lib/thin/backends/base.rb:61:in `start'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.3.1/lib/thin/server.rb:159:in `start'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler/thin.rb:13:in `run'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/bin/shotgun:156:in `<top (required)>'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/bin/shotgun:19:in `load'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/bin/shotgun:19:in `<main>'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/bin/ruby_noexec_wrapper:14:in `eval'
/Users/<username>/.rvm/gems/ruby-1.9.3-p125/bin/ruby_noexec_wrapper:14:in `<main>'

No estoy seguro de cuál es el problema?

Cualquier ayuda apreciada por favor.

Gracias.