text: # ==================================================================================================
  # Copyright 2013 Twitter, Inc.
  # --------------------------------------------------------------------------------------------------
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this work except in compliance with the License.
  # You may obtain a copy of the License in the LICENSE file, or at:
  #
  #  http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  # ==================================================================================================
  
  import time 
  
  from twitter.common.contextutil import Timer
  
  def test_timer():
    with Timer() as t:
      time.sleep(0.1)
      assert t.start < time.time()
      assert t.elapsed > 0
      time.sleep(0.1)
      assert t.elapsed > 0.1
      time.sleep(0.1)
      assert t.finish is None
    assert t.elapsed > 0.2
    assert t.finish < time.time()
  
  