Prevent duplicate navigation to debug URLs from Telemetry.

tools/telemetry/telemetry/core/browser_unittest.py

 # Copyright 2012 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.
 
 import logging
 import unittest
 
 from telemetry import benchmark
 from telemetry.core import browser_finder
 from telemetry.core import gpu_device
@@ skipping 139 matching lines @@
 
     self.assertTrue(isinstance(info, system_info.SystemInfo))
     self.assertTrue(hasattr(info, 'model_name'))
     self.assertTrue(hasattr(info, 'gpu'))
     self.assertTrue(isinstance(info.gpu, gpu_info.GPUInfo))
     self.assertTrue(hasattr(info.gpu, 'devices'))
     self.assertTrue(len(info.gpu.devices) > 0)
     for g in info.gpu.devices:
       self.assertTrue(isinstance(g, gpu_device.GPUDevice))
 
+  def testGetSystemInfoNotCachedObject(self):
+    b = self.CreateBrowser()
+    if not b.supports_system_info:
+      logging.warning(
+          'Browser does not support getting system info, skipping test.')
+      return
+
+    info_a = b.GetSystemInfo()
+    info_b = b.GetSystemInfo()
+    self.assertFalse(info_a is info_b)
+
   def testGetSystemTotalMemory(self):
     b = self.CreateBrowser()
     self.assertTrue(b.memory_stats['SystemTotalPhysicalMemory'] > 0)
 
   def testIsTracingRunning(self):
     b = self.CreateBrowser()
     if not b.supports_tracing:
       return
     self.assertFalse(b.is_tracing_running)
     b.StartTracing()
     self.assertTrue(b.is_tracing_running)
     b.StopTracing()
     self.assertFalse(b.is_tracing_running)