Refactor infra git libs and testing.

test.py

Index: test.py
diff --git a/test.py b/test.py
new file mode 100755
index 0000000000000000000000000000000000000000..3b96f6c30cbb87aef602f7512ec05c47749b2103
--- /dev/null
+++ b/test.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+# Copyright 2014 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.
+
+"""Entry point for all tests in this repo."""
+
+assert __name__ == '__main__'
+
+from infra.ext import testing_support  # pylint: disable=W0611
+from testing_support import expect_tests  # pylint: disable=F0401
+
+expect_tests.main(cover_branches=True, test_modules=expect_tests.ALL_MODULES)