old_contents: """
  sentry.tsdb.dummy
  ~~~~~~~~~~~~~~~~~
  
  :copyright: (c) 2010-2014 by the Sentry Team, see AUTHORS for more details.
  :license: BSD, see LICENSE for more details.
  """
  from __future__ import absolute_import
  
  from sentry.tsdb.base import BaseTSDB
  
  
  class DummyTSDB(BaseTSDB):
      """
      A no-op time-series storage.
      """
      def incr(self, model, key, timestamp=None, count=1):
          assert isinstance(key, (int, long)), 'Key is not an int'
  
      def get_range(self, model, keys, start, end, rollup=None):
          return dict((k, []) for k in keys)
  
new_contents: """
  sentry.tsdb.dummy
  ~~~~~~~~~~~~~~~~~
  
  :copyright: (c) 2010-2014 by the Sentry Team, see AUTHORS for more details.
  :license: BSD, see LICENSE for more details.
  """
  from __future__ import absolute_import
  
  from sentry.tsdb.base import BaseTSDB
  
  
  class DummyTSDB(BaseTSDB):
      """
      A no-op time-series storage.
      """
      def incr(self, model, key, timestamp=None, count=1):
          pass
  
      def get_range(self, model, keys, start, end, rollup=None):
          return dict((k, []) for k in keys)
  
subject: Correct invalid assertion