# File lib/dm-core/spec/setup.rb, line 45
      def require_spec_adapter
        desired_adapter = ENV['ADAPTER']
        if desired_adapter.nil? || desired_adapter == 'in_memory'
          ENV['ADAPTER_SUPPORTS'] = 'all'
          Adapters.use(Adapters::InMemoryAdapter)
        else
          require "dm-#{desired_adapter}-adapter/spec/setup"
        end
      end