add tests for owners database module in depot_tools

tests/owners_unittest.py

Index: tests/owners_unittest.py
diff --git a/tests/owners_unittest.py b/tests/owners_unittest.py
new file mode 100755
index 0000000000000000000000000000000000000000..874eb4a6acb98ba2eba5af7d72c93b8eda9885b1
--- /dev/null
+++ b/tests/owners_unittest.py
@@ -0,0 +1,135 @@
+#!/usr/bin/python
+# Copyright (c) 2011 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 owners.py."""
+
+import unittest
+
+import owners
+from tests import filesystem_mock
+
+
+def test_repo():
+  return filesystem_mock.MockFileSystem(files={
+    '/DEPS' : '',
+    '/OWNERS':
+      ('# OWNERS'
+       '*\n'),
+    '/base/vlog.h':
+      '// vlog.h\n',
+    '/chrome/OWNERS':
+      ('ben@example.com\n'
+       'brettw@example.com\n'),
+    '/chrome/gpu/OWNERS':
+      ('kbr@example.com\n'),
+    '/chrome/gpu/gpu_channel.h':
+      '// gpu_channel.h\n',
+    '/chrome/renderer/OWNERS':
+      ('pkasting@example.com\n'),
+    '/chrome/renderer/gpu/gpu_channel_host.h':
+      '// gpu_channel_host.h\n',
+    '/chrome/renderer/safe_browsing/scorer.h':
+      '// scorer.h\n',
+    '/content/OWNERS':
+      ('set noparent\n'
+       'jam@example.com\n'
+       'darin@example.com\n'),
+    '/content/content.gyp':
+      '# content.gyp\n',
+  })
+
+
+ben = 'ben@example.com'
+brett = 'brettw@example.com'
+darin = 'darin@example.com'
+jam = 'jam@example.com'
+kbr = 'kbr@example.com'
+pkasting = 'pkasting@example.com'
+
+
+class OwnersDatabaseTest(unittest.TestCase):
+  def setUp(self):
+    self.repo = test_repo()
+    self.files = self.repo.files
+    self.root = '/'
+
+    # pylint: disable=W0108
+    self.fopen = self.repo.open_for_reading
+
+  def db(self, root=None, fopen=None, os_path=None):
+    root = root or self.root
+    fopen = fopen or self.fopen
+    os_path = os_path or self.repo
+    return owners.Database(root, fopen, os_path)
+
+  def assertReviewersFor(self, files, expected_reviewers):
+    db = self.db()
+    self.assertEquals(db.ReviewersFor(set(files)), set(expected_reviewers))
+
+  def assertCoveredBy(self, files, reviewers):
+    db = self.db()
+    self.assertTrue(db.FilesAreCoveredBy(set(files), set(reviewers)))
+
+  def assertNotCoveredBy(self, files, reviewers, unreviewed_files):
+    db = self.db()
+    self.assertEquals(db.FilesNotCoveredBy(set(files), set(reviewers)),
+                      set(unreviewed_files))
+
+  def test_constructor(self):
+    self.assertNotEquals(self.db(), None)
+
+  def test_owners_for(self):
+    self.assertReviewersFor(['DEPS'], [owners.ANYONE])
+    self.assertReviewersFor(['content/content.gyp'], [jam, darin])
+    self.assertReviewersFor(['chrome/gpu/gpu_channel.h'], [kbr])
+
+  def test_covered_by(self):
+    self.assertCoveredBy(['DEPS'], [jam])
+    self.assertCoveredBy(['DEPS'], [darin])
+    self.assertCoveredBy(['content/content.gyp'], [jam])
+    self.assertCoveredBy(['chrome/gpu/OWNERS'], [kbr])
+    self.assertCoveredBy(['chrome/gpu/OWNERS'], [ben])
+
+  def test_not_covered_by(self):
+    self.assertNotCoveredBy(['DEPS'], [], ['DEPS'])
+    self.assertNotCoveredBy(['content/content.gyp'], [ben],
+      ['content/content.gyp'])
+    self.assertNotCoveredBy(
+      ['chrome/gpu/gpu_channel.h', 'chrome/renderer/gpu/gpu_channel_host.h'],
+      [pkasting], ['chrome/gpu/gpu_channel.h'])
+    self.assertNotCoveredBy(
+      ['chrome/gpu/gpu_channel.h', 'chrome/renderer/gpu/gpu_channel_host.h'],
+      [ben], [])
+
+  def test_comments_in_owners_file(self):
+    # pylint: disable=W0212
+    db = self.db()
+    # Tests that this doesn't raise an error.
+    db._ReadOwnersFile('OWNERS', 'DEPS')
+
+  def test_syntax_error_in_owners_file(self):
+    # pylint: disable=W0212
+    db = self.db()
+    self.files['/foo/OWNERS'] = '{}\n'
+    self.files['/foo/DEPS'] = '# DEPS\n'
+    self.assertRaises(owners.SyntaxErrorInOwnersFile, db._ReadOwnersFile,
+      '/foo/OWNERS', '/foo/DEPS')
+
+    self.files['/bar/OWNERS'] = 'set myparentislinus\n'
+    self.files['/bar/DEPS'] = '# DEPS\n'
+    self.assertRaises(owners.SyntaxErrorInOwnersFile, db._ReadOwnersFile,
+      '/bar/OWNERS', '/bar/DEPS')
+
+  def test_owners_propagates_down(self):
+    self.assertCoveredBy(['/chrome/renderer/gpu/gpu_channel_host.h'],
+      [pkasting])
+
+  def test_set_noparent(self):
+    self.assertNotCoveredBy(['/content/content.gyp'], [pkasting],
+      ['/content/content.gyp'])
+
+
+if __name__ == '__main__':
+  unittest.main()