Add PyAuto test for DeviceGuestModeEnabled policy

chrome/test/functional/chromeos_device_policy.py

Index: chrome/test/functional/chromeos_device_policy.py
diff --git a/chrome/test/functional/chromeos_device_policy.py b/chrome/test/functional/chromeos_device_policy.py
new file mode 100644
index 0000000000000000000000000000000000000000..73d93c1eb3ea5b3bae45ebc4c28ce438ea94fb94
--- /dev/null
+++ b/chrome/test/functional/chromeos_device_policy.py
@@ -0,0 +1,112 @@
+# 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 pyauto_functional  # Must come before pyauto (and thus, policy_base).
+import policy_base
+
+
+class ChromeosDevicePolicy(policy_base.PolicyTestBase):
+  """Tests various ChromeOS device policies."""
+
+  def _SetDevicePolicyAndOwner(self, policy):
+    self.SetDevicePolicy(device_policy=policy, owner=self._owner)
+
+  def Login(self, as_guest):
+    self.assertFalse(self.GetLoginInfo()['is_logged_in'],
+                     msg='Expected to be logged out.')
+    if as_guest:
+      self.LoginAsGuest()
+    else:
+      policy_base.PolicyTestBase.Login(self, self._owner, self._password)
+    self.assertTrue(self.GetLoginInfo()['is_logged_in'],
+                    msg='Expected to be logged in.')
+
+  # TODO(bartfab): Remove this after crosbug.com/20709 is fixed.
+  def TryToDisableLocalStateAutoClearing(self):
+    # Try to disable automatic clearing of the local state.
+    self.TryToDisableLocalStateAutoClearingOnChromeOS()
+    self._local_state_auto_clearing = \
+        self.IsLocalStateAutoClearingEnabledOnChromeOS()
+    if not self._local_state_auto_clearing:
+      # Prevent the inherited Logout() method from cleaning up /home/chronos
+      # as this also clears the local state.
+      self.set_clear_profile(False)
+
+  def ExtraChromeFlags(self):
+    """Sets up Chrome to skip OOBE.
+
+    TODO(bartfab): Ensure OOBE is still skipped when crosbug.com/20709 is fixed.
+    Disabling automatic clearing of the local state has the curious side effect
+    of removing a flag that disables OOBE. This method adds back the flag.
+    """
+    flags = policy_base.PolicyTestBase.ExtraChromeFlags(self)
+    flags.append('--login-screen=login')
+    return flags
+
+  def setUp(self):
+    policy_base.PolicyTestBase.setUp(self)
+    # TODO(bartfab): Remove this after crosbug.com/20709 is fixed.
+    self._local_state_auto_clearing = \
+        self.IsLocalStateAutoClearingEnabledOnChromeOS()
+
+    # Cache owner credentials for easy lookup.
+    credentials = self.GetPrivateInfo()['prod_enterprise_test_user']
+    self._owner = credentials['username']
+    self._password = credentials['password']
+
+  def tearDown(self):
+    # TODO(bartfab): Remove this after crosbug.com/20709 is fixed.
+    # Try to re-enable automatic clearing of the local state and /home/chronos.
+    if not self._local_state_auto_clearing:
+      self.TryToEnableLocalStateAutoClearingOnChromeOS()
+      self.set_clear_profile(True)
+    policy_base.PolicyTestBase.tearDown(self)
+
+  def _CheckGuestModeAvailableInLoginWindow(self):
+    return self.ExecuteJavascriptInOOBEWebUI(
+        """window.domAutomationController.send(
+               !document.getElementById('guestSignin').hidden);""")
+
+  def _CheckGuestModeVailableInAccountPicker(self):
+    return self.ExecuteJavascriptInOOBEWebUI(
+        """window.domAutomationController.send(
+               !!document.getElementById('pod-row').

[Nirnimesh, 2012/05/16 15:44:37]

is that a double negation?

[bartfab (slow), 2012/05/16 18:07:10]

Yes, a common way to cast to bool in JavaScript, used many times in Chrome's
code. I can replace this with Boolean() if you prefer.

+                   getPodWithUsername_(''));""")

[Nirnimesh, 2012/05/16 15:44:37]

It looks like this fits in the previous line. Doesn't it?
You can keep the """ on this line

[bartfab (slow), 2012/05/16 18:07:10]

If I leave the """ on their own line, the rest fits onto the previous line.
Done.

+
+  def testGuestModeEnabled(self):
+    self._SetDevicePolicyAndOwner({'guest_mode_enabled': True})
+    self.assertTrue(self._CheckGuestModeAvailableInLoginWindow(),
+                    msg='Expected guest mode to be available.')
+    self.Login(as_guest=True)
+    self.Logout()
+
+    self._SetDevicePolicyAndOwner({'guest_mode_enabled': False})
+    self.assertFalse(self._CheckGuestModeAvailableInLoginWindow(),
+                     msg='Expected guest mode to not be available.')
+
+    # TODO(bartfab): Remove this after crosbug.com/20709 is fixed.
+    self.TryToDisableLocalStateAutoClearing()
+    if self._local_state_auto_clearing:
+      logging.warn("""Unable to disable local state clearing. Skipping remainder
+                      of test.""")
+      return
+
+    # Log in in as a regular so that the pod row contains at least one pod and

[Nirnimesh, 2012/05/16 15:44:37]

remove double 'in'

[bartfab (slow), 2012/05/16 18:07:10]

Done.

+    # the account picker is shown.
+    self.Login(as_guest=False)
+    self.Logout()
+
+    self._SetDevicePolicyAndOwner({'guest_mode_enabled': True})
+    self.assertTrue(self._CheckGuestModeVailableInAccountPicker(),
+                    msg='Expected guest mode to be available.')
+    self.Login(as_guest=True)
+    self.Logout()
+
+    self._SetDevicePolicyAndOwner({'guest_mode_enabled': False})
+    self.assertFalse(self._CheckGuestModeVailableInAccountPicker(),
+                     msg='Expected guest mode to not be available.')
+
+
+if __name__ == '__main__':
+  pyauto_functional.Main()