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

The framework ran commands from the current working directory. Make it run commands from the framework's directory.

NOTRY=True 
BUG=264859
1) Uninstall Chrome (if it's installed.)
2) Build Chrome with Release mode and make sure that mini_installer.exe is created.
3) Go to src\chrome\test\mini_installer
4) Run "python test_installer.py config\config.config --build-dir=<build-dir> --target=Release" where <build-dir> is the path to main build directory (the parent of the Release directory). The test should pass.
5) Go to src\chrome\test
6) Run "python mini_installer\test_installer.py mini_installer\config\config.config --build-dir=<build-dir> --target=Release". The test should pass.

Review URL: https://chromiumcodereview.appspot.com/23557009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221361 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/mini_installer/test_installer.py

@@ -106,11 +106,17 @@ class InstallerTest(unittest.TestCase):
       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):