[chromedriver] Implement DELETE NetworkConditions

chrome/test/chromedriver/test/run_py_tests.py

 #!/usr/bin/env python
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """End to end tests for ChromeDriver."""
 
 import base64
 import json
 import math
@@ skipping 782 matching lines @@
 
   def testMobileEmulationDisabledByDefault(self):
     self.assertFalse(self._driver.capabilities['mobileEmulationEnabled'])
 
   def testChromeDriverSendLargeData(self):
     script = 's = ""; for (i = 0; i < 10e6; i++) s += "0"; return s;'
     lots_of_data = self._driver.ExecuteScript(script)
     self.assertEquals('0'.zfill(int(10e6)), lots_of_data)
 
   def testEmulateNetworkConditions(self):
+    # Network conditions must be set before it can be retrieved.
+    self.assertRaises(chromedriver.UnknownError,
+                      self._driver.GetNetworkConditions)
+
     # DSL: 2Mbps throughput, 5ms RTT
     latency = 5
     throughput = 2048 * 1024
     self._driver.SetNetworkConditions(latency, throughput, throughput)
 
     network = self._driver.GetNetworkConditions()
     self.assertEquals(latency, network['latency']);
     self.assertEquals(throughput, network['download_throughput']);
     self.assertEquals(throughput, network['upload_throughput']);
     self.assertEquals(False, network['offline']);
 
+    # Network Conditions again cannot be retrieved after they've been deleted.
+    self._driver.DeleteNetworkConditions()
+    self.assertRaises(chromedriver.UnknownError,
+                      self._driver.GetNetworkConditions)
+
   def testEmulateNetworkConditionsName(self):
     # DSL: 2Mbps throughput, 5ms RTT
     #latency = 5
     #throughput = 2048 * 1024
     self._driver.SetNetworkConditionsName('DSL')
 
     network = self._driver.GetNetworkConditions()
     self.assertEquals(5, network['latency']);
     self.assertEquals(2048*1024, network['download_throughput']);
     self.assertEquals(2048*1024, network['upload_throughput']);
@@ skipping 714 matching lines @@
 
   all_tests_suite = unittest.defaultTestLoader.loadTestsFromModule(
       sys.modules[__name__])
   tests = unittest_util.FilterTestSuite(all_tests_suite, options.filter)
   ChromeDriverTest.GlobalSetUp()
   MobileEmulationCapabilityTest.GlobalSetUp()
   result = unittest.TextTestRunner(stream=sys.stdout, verbosity=2).run(tests)
   ChromeDriverTest.GlobalTearDown()
   MobileEmulationCapabilityTest.GlobalTearDown()
   sys.exit(len(result.failures) + len(result.errors))