Cleanup machine based on the state in configuration file for mini installer test.

chrome/test/mini_installer/verifier.py

 # 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.
 
 
 class Verifier:
   """Verifies that the current machine states match the expectation."""
 
   def VerifyInput(self, verifier_input, variable_expander):
     """Verifies that the current machine states match |verifier_input|.
@@ skipping 32 matching lines @@
   def _EvaluateCondition(self, condition):
     """Evaluates |condition| using eval().
 
     Args:
       condition: A condition string.
 
     Returns:
       The result of the evaluated condition.
     """
     return eval(condition, {'__builtins__': {'False': False, 'True': True}})
+
+  def _Assert(self, is_true, message):
+    """ Check whether the test result equals to the expectation.
+
+        Args:
+          is_true: A boolean represents whether the assert is success.
+          message: The error message if assert failed.
+    """
+    assert is_true, message