1 files changed, 49 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestStateWatching.cpp b/xpcom/tests/gtest/TestStateWatching.cpp
new file mode 100644
index 0000000000..a0d68d85e3
--- /dev/null
+++ b/xpcom/tests/gtest/TestStateWatching.cpp
@@ -0,0 +1,49 @@
+/* -*- 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/SharedThreadPool.h"
+#include "mozilla/StateWatching.h"
+#include "mozilla/TaskQueue.h"
+#include "mozilla/Unused.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() = default;
+};
+
+TEST(WatchManager, Shutdown)
+{
+  RefPtr<TaskQueue> queue =
+      new TaskQueue(GetMediaThreadPool(MediaThreadType::SUPERVISOR));
+
+  RefPtr<Foo> p = new Foo;
+  WatchManager<Foo> manager(p, queue);
+  Watchable<bool> notifier(false, "notifier");
+
+  Unused << queue->Dispatch(NS_NewRunnableFunction(
+      "TestStateWatching::WatchManager_Shutdown_Test::TestBody", [&]() {
+        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