Bug 1290338. Part 1 - add a gtest to test WatchManager::Shutdown(). r=bholley

MozReview-Commit-ID: CJ3JJU2zLUF

--HG--
extra : rebase_source : 2495a541366c5baedec3eddf135e2507589824c6

xpcom/tests/gtest/TestStateWatching.cpp

@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/StateWatching.h"
+#include "mozilla/TaskQueue.h"
+#include "nsISupportsImpl.h"
+#include "VideoUtils.h"
+
+namespace TestStateWatching {
+
+using namespace mozilla;
+
+struct Foo {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(Foo)
+  void Notify() { mNotified = true; }
+  bool mNotified = false;
+private:
+  ~Foo() {}
+};
+
+TEST(WatchManager, Shutdown)
+{
+  RefPtr<TaskQueue> queue = new TaskQueue(
+    GetMediaThreadPool(MediaThreadType::PLAYBACK));
+
+  RefPtr<Foo> p = new Foo;
+  WatchManager<Foo> manager(p, queue);
+  Watchable<bool> notifier(false, "notifier");
+
+  queue->Dispatch(NS_NewRunnableFunction([&] () {
+    manager.Watch(notifier, &Foo::Notify);
+    notifier = true; // Trigger the call to Foo::Notify().
+    manager.Shutdown(); // Shutdown() should cancel the call.
+  }));
+
+  queue->BeginShutdown();
+  queue->AwaitShutdownAndIdle();
+  EXPECT_FALSE(p->mNotified);
+}
+
+} // namespace TestStateWatching

xpcom/tests/gtest/moz.build

@@ -17,6 +17,7 @@ UNIFIED_SOURCES += [
     'TestPLDHash.cpp',
     'TestPriorityQueue.cpp',
     'TestSnappyStreams.cpp',
+    'TestStateWatching.cpp',
     'TestStorageStream.cpp',
     'TestStrings.cpp',
     'TestStringStream.cpp',