new_contents: #!/usr/bin/env python
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License 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.
  
  from test.unit.helper.test_helper import appium_command, android_w3c_driver, ios_w3c_driver
  
  import json
  import httpretty
  
  
  class TestWebDriverDeviceLock(object):
  
      @httpretty.activate
      def test_lock(self):
          driver = android_w3c_driver()
          httpretty.register_uri(
              httpretty.POST,
              appium_command('/session/1234567890/appium/device/lock'),
              body='{"value": ""}'
          )
          driver.lock(1)
          d = json.loads(httpretty.last_request().body.decode('utf-8'))
          assert d['seconds'] == 1
  
      @httpretty.activate
      def test_lock_no_args(self):
          driver = android_w3c_driver()
          httpretty.register_uri(
              httpretty.POST,
              appium_command('/session/1234567890/appium/device/lock'),
              body='{"value": ""}'
          )
          driver.lock()
          d = json.loads(httpretty.last_request().body.decode('utf-8'))
          assert len(d.keys()) == 1
          assert d['sessionId'] == '1234567890'
  
subject: Add unit test for lock lib (#287)