# File lib/rspec/core/configuration.rb, line 190
      def expect_with(*frameworks)
        settings[:expectation_frameworks] = []
        frameworks.each do |framework|
          case framework
          when Symbol
            case framework
            when :rspec
              require 'rspec/core/expecting/with_rspec'
            when :stdlib
              require 'rspec/core/expecting/with_stdlib'
            else
              raise ArgumentError, "#{framework.inspect} is not supported"
            end
            settings[:expectation_frameworks] << RSpec::Core::ExpectationFrameworkAdapter
          end
        end
      end