Add unit tests for git_find_releases

R=ehmaldonado@chromium.org

Change-Id: Ib11ada368fda13bbef62c8be26ddb9c78a528a92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2107839
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>

git_find_releases.py

@@ -35,9 +35,9 @@ def GetMergesForCommit(sha1):
                   'cherry picked from commit %s' % sha1).splitlines()]
 
 
-def main():
+def main(args):
   parser = optparse.OptionParser(usage=sys.modules[__name__].__doc__)
-  _, args = parser.parse_args()
+  _, args = parser.parse_args(args)
 
   if len(args) == 0:
     parser.error('Need at least one commit.')
@@ -61,7 +61,7 @@ def main():
 
 if __name__ == '__main__':
   try:
-    sys.exit(main())
+    sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)

tests/git_find_releases_test.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env vpython3
+# coding=utf-8
+# Copyright 2020 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_find_releases.py."""
+
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import logging
+import os
+import sys
+import unittest
+
+if sys.version_info.major == 2:
+  from StringIO import StringIO
+  import mock
+else:
+  from io import StringIO
+  from unittest import mock
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+import git_find_releases
+import git_common
+
+
+class TestGitFindReleases(unittest.TestCase):
+  @mock.patch('sys.stdout', StringIO())
+  @mock.patch('git_common.run', return_value='')
+  def test_invalid_commit(self, git_run):
+    result = git_find_releases.main(['foo'])
+    self.assertEqual(1, result)
+    self.assertEqual('foo not found', sys.stdout.getvalue().strip())
+    git_run.assert_called_once_with('name-rev', '--tags', '--name-only', 'foo')
+
+  @mock.patch('sys.stdout', StringIO())
+  @mock.patch('git_common.run')
+  def test_no_merge(self, git_run):
+    def git_run_function(*args):
+      assert len(args) > 1
+      if args[0] == 'name-rev' and args[1] == '--tags':
+        return 'undefined'
+      elif args[0] == 'name-rev' and args[1] == '--refs':
+        return '1.0.0'
+      elif args[0] == 'log':
+        return ''
+      assert False, "Unexpected arguments for git.run"
+
+    git_run.side_effect = git_run_function
+    result = git_find_releases.main(['foo'])
+    self.assertEqual(0, result)
+    stdout = sys.stdout.getvalue().strip()
+    self.assertIn('commit foo was', stdout)
+    self.assertIn('No merges found', stdout)
+    self.assertEqual(3, git_run.call_count)
+
+
+if __name__ == '__main__':
+  logging.basicConfig(
+      level=logging.DEBUG if '-v' in sys.argv else logging.ERROR)
+  unittest.main()