diff --git a/dom/media/gtest/TestMediaUtils.cpp b/dom/media/gtest/TestMediaUtils.cpp
new file mode 100644
index 0000000000000..69ae314d3e252
--- /dev/null
+++ b/dom/media/gtest/TestMediaUtils.cpp
@@ -0,0 +1,197 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "MediaUtils.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/gtest/MozHelpers.h"
+
+using namespace mozilla;
+using namespace mozilla::gtest;
+using namespace mozilla::media;
+
+// Spawning the death test child process aborts on Android.
+#if !defined(ANDROID)
+
+// Kept here for reference as it can be handy during development.
+#  define DISABLE_CRASH_REPORTING  \
+    gtest::DisableCrashReporter(); \
+    ZERO_GDB_SLEEP();
+
+void DoCreateTicketBeforeAppShutdownOnMain() {
+  auto reporter = ScopedTestResultReporter::Create(ExitMode::ExitOnDtor);
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownNetTeardown);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTeardown);
+
+  Monitor mon("TestMonitor");
+  bool pastAppShutdown = false;
+  bool backgroundTaskFinished = false;
+
+  UniquePtr ticket = ShutdownBlockingTicket::Create(
+      u"Test"_ns, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__);
+
+  MOZ_ALWAYS_SUCCEEDS(
+      NS_DispatchBackgroundTask(NS_NewRunnableFunction(__func__, [&] {
+        TimeStamp now = TimeStamp::Now();
+        TimeStamp end = now + TimeDuration::FromSeconds(0.2);
+        MonitorAutoLock lock(mon);
+        while (!pastAppShutdown && (end - now) > TimeDuration()) {
+          lock.Wait(end - now);
+          now = TimeStamp::Now();
+        }
+        EXPECT_FALSE(pastAppShutdown);
+        ticket = nullptr;
+        while (!pastAppShutdown) {
+          lock.Wait();
+        }
+        EXPECT_TRUE(pastAppShutdown);
+        backgroundTaskFinished = true;
+        lock.Notify();
+      })));
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdown);
+
+  {
+    MonitorAutoLock lock(mon);
+    pastAppShutdown = true;
+    lock.Notify();
+    while (!backgroundTaskFinished) {
+      lock.Wait();
+    }
+  }
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownQM);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTelemetry);
+
+  NS_ShutdownXPCOM(nullptr);
+}
+
+void DoCreateTicketAfterAppShutdownOnMain() {
+  auto reporter = ScopedTestResultReporter::Create(ExitMode::ExitOnDtor);
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownNetTeardown);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTeardown);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdown);
+
+  auto ticket = ShutdownBlockingTicket::Create(
+      u"Test"_ns, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__);
+  EXPECT_FALSE(ticket);
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownQM);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTelemetry);
+
+  NS_ShutdownXPCOM(nullptr);
+}
+
+void DoCreateTicketBeforeAppShutdownOffMain() {
+  auto reporter = ScopedTestResultReporter::Create(ExitMode::ExitOnDtor);
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownNetTeardown);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTeardown);
+
+  Monitor mon("TestMonitor");
+  bool pastAppShutdown = false;
+  bool ticketCreated = false;
+  bool backgroundTaskFinished = false;
+
+  MOZ_ALWAYS_SUCCEEDS(
+      NS_DispatchBackgroundTask(NS_NewRunnableFunction(__func__, [&] {
+        MonitorAutoLock lock(mon);
+        auto ticket = ShutdownBlockingTicket::Create(
+            u"Test"_ns, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__);
+        EXPECT_TRUE(ticket);
+        ticketCreated = true;
+        lock.Notify();
+
+        TimeStamp now = TimeStamp::Now();
+        TimeStamp end = now + TimeDuration::FromSeconds(0.2);
+        while (!pastAppShutdown && (end - now) > TimeDuration()) {
+          lock.Wait(end - now);
+          now = TimeStamp::Now();
+        }
+        EXPECT_FALSE(pastAppShutdown);
+        ticket = nullptr;
+        while (!pastAppShutdown) {
+          lock.Wait();
+        }
+        EXPECT_TRUE(pastAppShutdown);
+        backgroundTaskFinished = true;
+        lock.Notify();
+      })));
+
+  {
+    MonitorAutoLock lock(mon);
+    while (!ticketCreated) {
+      lock.Wait();
+    }
+  }
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdown);
+
+  MonitorAutoLock lock(mon);
+  pastAppShutdown = true;
+  lock.Notify();
+  while (!backgroundTaskFinished) {
+    lock.Wait();
+  }
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownQM);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTelemetry);
+
+  NS_ShutdownXPCOM(nullptr);
+}
+
+void DoCreateTicketAfterAppShutdownOffMain() {
+  auto reporter = ScopedTestResultReporter::Create(ExitMode::ExitOnDtor);
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownNetTeardown);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTeardown);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdown);
+
+  UniquePtr<ShutdownBlockingTicket> ticket;
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchBackgroundTask(
+      MakeAndAddRef<SyncRunnable>(NS_NewRunnableFunction(__func__, [&] {
+        ticket = ShutdownBlockingTicket::Create(
+            u"Test"_ns, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__);
+      }))));
+
+  EXPECT_FALSE(ticket);
+
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownQM);
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::AppShutdownTelemetry);
+
+  NS_ShutdownXPCOM(nullptr);
+}
+
+TEST(ShutdownBlockingTicketDeathTest, CreateTicketBeforeAppShutdownOnMain)
+{
+  EXPECT_EXIT(DoCreateTicketBeforeAppShutdownOnMain(),
+              testing::ExitedWithCode(0), "");
+}
+
+TEST(ShutdownBlockingTicketDeathTest, CreateTicketAfterAppShutdownOnMain)
+{
+  EXPECT_EXIT(DoCreateTicketAfterAppShutdownOnMain(),
+              testing::ExitedWithCode(0), "");
+}
+
+TEST(ShutdownBlockingTicketDeathTest, CreateTicketBeforeAppShutdownOffMain)
+{
+  EXPECT_EXIT(DoCreateTicketBeforeAppShutdownOffMain(),
+              testing::ExitedWithCode(0), "");
+}
+
+TEST(ShutdownBlockingTicketDeathTest, CreateTicketAfterAppShutdownOffMain)
+{
+  EXPECT_EXIT(DoCreateTicketAfterAppShutdownOffMain(),
+              testing::ExitedWithCode(0), "");
+}
+
+#  undef DISABLE_CRASH_REPORTING
+
+#endif
diff --git a/dom/media/gtest/moz.build b/dom/media/gtest/moz.build
index d3917ccd270f6..4eb1e61806d72 100644
--- a/dom/media/gtest/moz.build
+++ b/dom/media/gtest/moz.build
@@ -53,6 +53,7 @@ UNIFIED_SOURCES += [
     "TestMediaMIMETypes.cpp",
     "TestMediaQueue.cpp",
     "TestMediaSpan.cpp",
+    "TestMediaUtils.cpp",
     "TestMP3Demuxer.cpp",
     "TestMP4Demuxer.cpp",
     "TestMuxer.cpp",