Check for stray threads from tests and fail if found

testing_support/thread_watcher.py

Index: testing_support/thread_watcher.py
diff --git a/testing_support/thread_watcher.py b/testing_support/thread_watcher.py
new file mode 100644
index 0000000000000000000000000000000000000000..2a5dc1683ca2c9ebb53549a484f766591adec89f
--- /dev/null
+++ b/testing_support/thread_watcher.py
@@ -0,0 +1,31 @@
+# Copyright (c) 2016 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.
+
+
+import threading
+import unittest
+
+
+class ThreadWatcherMixIn(object):
+  def setUp(self):
+    self._pre_test_threads = [t.ident for t in threading.enumerate()]
+
+  def tearDown(self):
+    new_threads = [t for t in threading.enumerate()
+                   if t.ident not in self._pre_test_threads]
+    if new_threads:
+      self.fail('Found %d running thread(s) after the test: %s' % (
+        len(new_threads), ', '.join(t.name for t in new_threads)))
+
+
+
+class TestCase(unittest.TestCase, ThreadWatcherMixIn):
+  """Base unittest class that cleans off a trial directory in tearDown()."""

[tandrii(chromium), 2016/06/14 10:21:43]

update doc

[Sergiy Byelozyorov, 2016/06/14 19:47:01]

Done.

+  def setUp(self):
+    super(TestCase, self).setUp()
+    ThreadWatcherMixIn.setUp(self)
+
+  def tearDown(self):
+    ThreadWatcherMixIn.tearDown(self)
+    super(TestCase, self).tearDown()