# File lib/rspec/core/command_line.rb, line 14
      def run(err, out)
        @options.configure(@configuration)
        @configuration.error_stream = err
        @configuration.output_stream ||= out
        @configuration.load_spec_files
        @configuration.configure_mock_framework
        @world.announce_inclusion_filter
        @world.announce_exclusion_filter

        @configuration.reporter.report(example_count) do |reporter|
          begin
            @configuration.run_hook(:before, :suite)
            example_groups.run_examples(reporter)
          ensure
            @configuration.run_hook(:after, :suite)
          end
        end

        example_groups.success?
      end