Added GPU stress test with multiple tabs in one single window.

content/test/gpu/gpu_stress_tests/gpu_stress_unittest.py

+# Copyright (c) 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 os
+import random
+import unittest
+
+from telemetry.core import browser_finder
+from telemetry.test import options_for_unittests
+
+CUR_DIR = os.path.dirname(__file__)
+DATA_DIR = os.path.join(CUR_DIR, os.pardir, os.pardir, 'data', 'gpu')
+
+# Number of tabs to open for testing.
+NUM_TABS = 100
+
+
+class GpuValidationUnittest(unittest.TestCase):
+  """Verifies that GPU works properly under stress."""
+
+  def setUp(self):
+    """Gets the test assets  and launches browser.
+
+    Test assets are html files from test data directory.
+    """
+
+    # Gets the test assets.
+    self._asset_list = []
+    for _, _, files in os.walk(DATA_DIR):
+      self._asset_list.extend([f for f in files if f.endswith('.html')])
+    self._num_assets = len(self._asset_list)
+
+    # Launches browser.
+    options = options_for_unittests.GetCopy()
+    browser_to_create = browser_finder.FindBrowser(options)
+    self._browser = browser_to_create.Create()
+    self._browser.SetHTTPServerDirectories([DATA_DIR])
+    self._tabs = self._browser.tabs
+
+  def tearDown(self):
+    self._browser.Close()
+
+  def testMultipleTabsInSingleWindow(self):
+    """Tests with multiple tabs opened in a single window."""
+
+    # Opens the tabs and navigates to the asset urls.
+    for i in xrange(NUM_TABS):
+      asset = self._asset_list[i % self._num_assets]
+      tab = self._tabs.New()
+      tab.Navigate(self._GetUrl(asset))
+
+    # Randomly cycles to the tabs.
+    tab_nums = range(1, NUM_TABS + 1)

[dtu, 2013/04/03 00:32:49]

xrange

[Danh Nguyen, 2013/04/03 15:21:58]

xrange doesn't work with random.shuffle() on the next line, so I need to use
range() here.

+    random.shuffle(tab_nums)
+    for num in tab_nums:
+      self._tabs[num].Activate()
+
+    # Randomly closes the tabs.
+    num_tabs = len(self._tabs)
+    while num_tabs  > 1:

[dtu, 2013/04/03 00:32:49]

Why not just always len(self._tabs)?

[Danh Nguyen, 2013/04/03 15:21:58]

Done.  Thanks, Dave. The loop looks much better now.

+      self._tabs[random.randrange(1, num_tabs)].Close()
+      num_tabs -= 1
+
+  def _GetUrl(self, asset):
+    return self._browser.http_server.UrlOf(asset)