# File lib/deltacloud/drivers/mock/mock_driver.rb, line 159
    def instances(credentials, opts=nil)
      check_credentials( credentials )
      instances = @client.build_all(Instance)
      instances = filter_on( instances, :owner_id, :owner_id => credentials.user )
      instances = filter_on( instances, :id, opts )
      instances = filter_on( instances, :state, opts )
      instances
    end