diff --git a/tests/testutil.py b/tests/testutil.py
index 9534bff4382ead304b93a66256879a0ad1905e69..74ae8f24cfae926af23fe02f6de24dfdd83ffc89 100644
--- a/tests/testutil.py
+++ b/tests/testutil.py
@@ -17,12 +17,14 @@
 import datetime
 import itertools
 import re
+import unittest.mock
 
 import beancount.core.amount as bc_amount
 import beancount.core.data as bc_data
 import beancount.loader as bc_loader
 import beancount.parser.options as bc_options
 
+import git
 import odf.element
 import odf.opendocument
 import odf.table
@@ -288,6 +290,13 @@ class TestConfig:
         return self._rt_wrapper
 
 
+def TestRepo(head_hexsha='abcd1234', dirty=False):
+    retval = unittest.mock.Mock(spec=git.Repo)
+    retval.is_dirty.return_value = dirty
+    retval.head.commit.hexsha = head_hexsha
+    return retval
+
+
 class _TicketBuilder:
     MESSAGE_ATTACHMENTS = [
         ('(Unnamed)', 'multipart/alternative', '0b'),