[Predator] Add local cache for get command output.

appengine/findit/util_scripts/test/script_util_test.py

Index: appengine/findit/util_scripts/test/script_util_test.py
diff --git a/appengine/findit/util_scripts/test/script_util_test.py b/appengine/findit/util_scripts/test/script_util_test.py
index 9237e24ae944e1cf7e8ce0e2a4df6151abf12c10..3fa7cf5bdb0dd9111640469d25071adb8a3e54fd 100644
--- a/appengine/findit/util_scripts/test/script_util_test.py
+++ b/appengine/findit/util_scripts/test/script_util_test.py
@@ -10,13 +10,14 @@ from testing_utils import testing
 
 class ScriptUtilTest(testing.AppengineTestCase):
 
+  # TODO(katesonia): Figure out a good way to work around cache.
   def testGetLocalGitCommandOutput(self):
     class _MockProcess(object):
       def __init__(self, command, *_):
         self.command = command
 
       def communicate(self, *_):
-        return self.command, 'dummy'
+        return self.command, 'error'
 
       @property
       def returncode(self):