Run commands in the mini_installer test framework from the framework's directory.

chrome/test/mini_installer/test_installer.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.
 
 """This script tests the installer with test cases specified in the config file.
 
 For each test case, it checks that the machine states after the execution of
 each command match the expected machine states. For more details, take a look at
 the design documentation at http://goo.gl/Q0rGM6
 """
@@ skipping 88 matching lines @@
       state: A state name.
     """
     try:
       verifier.Verify(self._config.states[state], self._path_resolver)
     except AssertionError as e:
       # If an AssertionError occurs, we intercept it and add the state name
       # to the error message so that we know where the test fails.
       raise AssertionError("In state '%s', %s" % (state, e))
 
   def _RunCommand(self, command):
-    exit_status = subprocess.call(self._path_resolver.ResolvePath(command),
-                                  shell=True)
+    """Runs the given command from the current file's directory.
+
+    Args:
+      command: A command to run. It is expanded using ResolvePath.
+    """
+    resolved_command = self._path_resolver.ResolvePath(command)
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    exit_status = subprocess.call(resolved_command, shell=True, cwd=script_dir)
     if exit_status != 0:
-      self.fail('Command %s returned non-zero exit status %s' % (command,
-                                                                 exit_status))
+      self.fail('Command %s returned non-zero exit status %s' % (
+          resolved_command, exit_status))
 
 
 def MergePropertyDictionaries(current_property, new_property):
   """Merges the new property dictionary into the current property dictionary.
 
   This is different from general dictionary merging in that, in case there are
   keys with the same name, we merge values together in the first level, and we
   override earlier values in the second level. For more details, take a look at
   http://goo.gl/uE0RoR
 
@@ skipping 91 matching lines @@
   assert os.path.exists(mini_installer_path), ('Could not find file %s' %
                                                mini_installer_path)
   config = ParseConfigFile(config_filename)
   if not RunTests(mini_installer_path, config):
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())