class RSpec::Core::Configuration

def bisect_runner_class
  @bisect_runner_class ||= begin
    case bisect_runner
    when :fork
      RSpec::Support.require_rspec_core 'bisect/fork_runner'
      Bisect::ForkRunner
    when :shell
      RSpec::Support.require_rspec_core 'bisect/shell_runner'
      Bisect::ShellRunner
    else
      raise "Unsupported value for `bisect_runner` (#{bisect_runner.inspect}). " \
            "Only `:fork` and `:shell` are supported."
    end
  end
end