Refactor platform_CryptohomeTestAuth + add testcase

client/site_tests/login_CryptohomeMounted/login_CryptohomeMounted.py

Index: client/site_tests/login_CryptohomeMounted/login_CryptohomeMounted.py
diff --git a/client/site_tests/login_CryptohomeMounted/login_CryptohomeMounted.py b/client/site_tests/login_CryptohomeMounted/login_CryptohomeMounted.py
index 8072ae04e61d109b8e85cda252adaf8ba59762cb..95445d18edc79aa62dc1278f9c4973f946ac4955 100644
--- a/client/site_tests/login_CryptohomeMounted/login_CryptohomeMounted.py
+++ b/client/site_tests/login_CryptohomeMounted/login_CryptohomeMounted.py
@@ -2,8 +2,14 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os
+from autotest_lib.client.bin import chromeos_constants
+from autotest_lib.client.bin import site_cryptohome, site_login, site_ui_test
 
-from autotest_lib.client.bin import site_login, site_ui_test
+
+TEST_USER = 'cryptohome_test@chromium.org'
+TEST_PASS = 'testme'
+TEST_FILE = os.path.join(chromeos_constants.CRYPTOHOME_MOUNT_PT, 'hello')
 
 
 class login_CryptohomeMounted(site_ui_test.UITest):
@@ -11,3 +17,10 @@ class login_CryptohomeMounted(site_ui_test.UITest):
 
     def run_once(self):
         site_login.wait_for_cryptohome()
+        site_login.attempt_logout()
+        site_cryptohome.remove_vault(TEST_USER)
+        site_cryptohome.mount_vault(TEST_USER, TEST_PASS, create=True)
+        open(TEST_FILE, 'w').close()
+        self.login()
+        site_login.wait_for_cryptohome()
+        self.assert_(not os.path.exists(TEST_FILE))