# File lib/rr/integrations/rspec_2.rb, line 32
      def hook
        ::RSpec.configure do |config|
          config.mock_with Mixin
          config.include RR::DSL
        end

        patterns =
          if ::RSpec.configuration.respond_to?(:backtrace_exclusion_patterns)
            ::RSpec.configuration.backtrace_exclusion_patterns
          else
            ::RSpec.configuration.backtrace_clean_patterns
          end

        unless patterns.include?(RR::Errors::BACKTRACE_IDENTIFIER)
          patterns.push(RR::Errors::BACKTRACE_IDENTIFIER)
        end
      end