Refactoring: Use fake cwd in release script tests.

tools/push-to-trunk/releases.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project 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 retrieves the history of all V8 branches and trunk revisions and
 # their corresponding Chromium revisions.
 
 # Requires a chromium checkout with branch heads:
 # gclient sync --with_branch_heads
 # gclient fetch
 
 import argparse
 import csv
 import itertools
 import json
 import os
 import re
 import sys
 
 from common_includes import *
 
 CHROMIUM = "CHROMIUM"
 
 CONFIG = {
   BRANCHNAME: "retrieve-v8-releases",
   PERSISTFILE_BASENAME: "/tmp/v8-releases-tempfile",
-  DOT_GIT_LOCATION: ".git",
   VERSION_FILE: "src/version.cc",
 }
 
 # Expression for retrieving the bleeding edge revision from a commit message.
 PUSH_MESSAGE_RE = re.compile(r".* \(based on bleeding_edge revision r(\d+)\)$")
 
 # Expression for retrieving the merged patches from a merge commit message
 # (old and new format).
 MERGE_MESSAGE_RE = re.compile(r"^.*[M|m]erged (.+)(\)| into).*$", re.M)
 
@@ skipping 420 matching lines @@
       UpdateChromiumCheckout,
       RetrieveChromiumV8Releases,
       RietrieveChromiumBranches,
       CleanUp,
       WriteOutput,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(Releases(CONFIG).Run())