1 files changed, 42 insertions, 0 deletions
diff --git a/mfbt/tests/gtest/TestMainThreadWeakPtr.cpp b/mfbt/tests/gtest/TestMainThreadWeakPtr.cpp
new file mode 100644
index 0000000000..1722ade8c1
--- /dev/null
+++ b/mfbt/tests/gtest/TestMainThreadWeakPtr.cpp
@@ -0,0 +1,42 @@
+/* -*- 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/WeakPtr.h"
+#include "mozilla/UniquePtr.h"
+#include <thread>
+
+using namespace mozilla;
+
+struct C : public SupportsWeakPtr {
+  int mNum{0};
+};
+
+struct HasWeakPtrToC {
+  explicit HasWeakPtrToC(C* c) : mPtr(c) {}
+
+  MainThreadWeakPtr<C> mPtr;
+
+  ~HasWeakPtrToC() {
+    MOZ_RELEASE_ASSERT(!NS_IsMainThread(), "Should be released OMT");
+  }
+};
+
+TEST(MFBT_MainThreadWeakPtr, Basic)
+{
+  auto c = MakeUnique<C>();
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
+
+  auto weakRef = MakeUnique<HasWeakPtrToC>(c.get());
+
+  std::thread t([weakRef = std::move(weakRef)] {});
+
+  MOZ_RELEASE_ASSERT(!weakRef);
+  c = nullptr;
+
+  t.join();
+}