1 files changed, 58 insertions, 0 deletions
diff --git a/accessible/tests/browser/browser_shutdown_multi_reference.js b/accessible/tests/browser/browser_shutdown_multi_reference.js
new file mode 100644
index 0000000000..a92f6faf61
--- /dev/null
+++ b/accessible/tests/browser/browser_shutdown_multi_reference.js
@@ -0,0 +1,58 @@
+/* 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/. */
+
+"use strict";
+
+add_task(async function () {
+  info("Creating a service");
+  // Create a11y service.
+  const [a11yInitObserver, a11yInit] = initAccService();
+  await a11yInitObserver;
+
+  let accService1 = Cc["@mozilla.org/accessibilityService;1"].getService(
+    Ci.nsIAccessibilityService
+  );
+  await a11yInit;
+  ok(accService1, "Service initialized");
+
+  // Add another reference to a11y service. This will not trigger
+  // 'a11y-init-or-shutdown' event
+  let accService2 = Cc["@mozilla.org/accessibilityService;1"].getService(
+    Ci.nsIAccessibilityService
+  );
+  ok(accService2, "Service initialized");
+
+  info("Removing all service references");
+  let canShutdown = false;
+  // This promise will resolve only if canShutdown flag is set to true. If
+  // 'a11y-init-or-shutdown' event with '0' flag comes before it can be shut
+  // down, the promise will reject.
+  const [a11yShutdownObserver, a11yShutdownPromise] = shutdownAccService();
+  await a11yShutdownObserver;
+  const a11yShutdown = new Promise((resolve, reject) =>
+    a11yShutdownPromise.then(flag =>
+      canShutdown
+        ? resolve()
+        : reject("Accessible service was shut down incorrectly")
+    )
+  );
+  // Remove first a11y service reference.
+  accService1 = null;
+  ok(!accService1, "Service is removed");
+  // Force garbage collection that should not trigger shutdown because there is
+  // another reference.
+  forceGC();
+
+  // Have some breathing room when removing a11y service references.
+  await TestUtils.waitForTick();
+
+  // Now allow a11y service to shutdown.
+  canShutdown = true;
+  // Remove last a11y service reference.
+  accService2 = null;
+  ok(!accService2, "Service is removed");
+  // Force garbage collection that should trigger shutdown.
+  forceGC();
+  await a11yShutdown;
+});