Allow 'git cache fetch' to re-bootstrap.

tests/git_cache_test.py

+#!/usr/bin/env python
+# Copyright 2015 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.
+
+"""Unit tests for git_cache.py"""
+
+import os
+import shutil
+import sys
+import tempfile
+import unittest
+
+DEPOT_TOOLS_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, DEPOT_TOOLS_ROOT)
+
+from testing_support import coverage_utils
+import git_cache
+
+class GitCacheTest(unittest.TestCase):
+  @classmethod
+  def setUpClass(cls):
+    cls.cache_dir = tempfile.mkdtemp(prefix='git_cache_test_')
+    git_cache.Mirror.SetCachePath(cls.cache_dir)
+
+  @classmethod
+  def tearDownClass(cls):
+    shutil.rmtree(cls.cache_dir, ignore_errors=True)
+
+  def testParseFetchSpec(self):
+    testData = [
+        ([], []),
+        (['master'], [('+refs/heads/master:refs/heads/master',
+                       r'\+refs/heads/master:.*')]),
+        (['master/'], [('+refs/heads/master:refs/heads/master',
+                       r'\+refs/heads/master:.*')]),
+        (['+master'], [('+refs/heads/master:refs/heads/master',
+                       r'\+refs/heads/master:.*')]),
+        (['refs/heads/*'], [('+refs/heads/*:refs/heads/*',
+                            r'\+refs/heads/\*:.*')]),
+        (['foo/bar/*', 'baz'], [('+refs/heads/foo/bar/*:refs/heads/foo/bar/*',
+                                r'\+refs/heads/foo/bar/\*:.*'),
+                               ('+refs/heads/baz:refs/heads/baz',
+                                r'\+refs/heads/baz:.*')]),
+        (['refs/foo/*:refs/bar/*'], [('+refs/foo/*:refs/bar/*',
+                                      r'\+refs/foo/\*:.*')])
+        ]
+
+    mirror = git_cache.Mirror('test://phony.example.biz')
+    for fetch_specs, expected in testData:
+      mirror = git_cache.Mirror('test://phony.example.biz', refs=fetch_specs)
+      self.assertItemsEqual(mirror.fetch_specs, expected)
+
+if __name__ == '__main__':
+  sys.exit(coverage_utils.covered_main((
+    os.path.join(DEPOT_TOOLS_ROOT, 'git_cache.py')
+  ), required_percentage=0))