gistfile1.rb

    # ==== Returns
    # Boolean:: True if Merb environment is testing for instance,
    # Merb is running with RSpec, Test::Unit of other testing facility.
    #
    # :api: public
    def testing?
      $TESTING ||= env?(:test) || Merb::Config[:testing]
    end
   
    # ... snip ...

    # Set the environment if it hasn't already been set.
    Merb.environment ||= ENV["MERB_ENV"] || Merb::Config[:environment] || (Merb.testing? ? "test" : "development")