1 files changed, 64 insertions, 0 deletions
diff --git a/accessible/tests/browser/browser_shutdown_acc_reference.js b/accessible/tests/browser/browser_shutdown_acc_reference.js
new file mode 100644
index 0000000000..68c07ba2b6
--- /dev/null
+++ b/accessible/tests/browser/browser_shutdown_acc_reference.js
@@ -0,0 +1,64 @@
+/* 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() {
+  // Create a11y service.
+  const [a11yInitObserver, a11yInit] = initAccService();
+  await a11yInitObserver;
+
+  let accService = Cc["@mozilla.org/accessibilityService;1"].getService(
+    Ci.nsIAccessibilityService
+  );
+
+  await a11yInit;
+  ok(accService, "Service initialized");
+
+  // Accessible object reference will live longer than the scope of this
+  // function.
+  let acc = await new Promise(resolve => {
+    let intervalId = setInterval(() => {
+      let tabAcc = accService.getAccessibleFor(gBrowser.selectedTab);
+      if (tabAcc) {
+        clearInterval(intervalId);
+        resolve(tabAcc);
+      }
+    }, 10);
+  });
+  ok(acc, "Accessible object is created");
+
+  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")
+    )
+  );
+
+  accService = null;
+  ok(!accService, "Service is removed");
+
+  // Force garbage collection that should not trigger shutdown because there is
+  // a reference to an accessible object.
+  forceGC();
+  // Have some breathing room when removing a11y service references.
+  await TestUtils.waitForTick();
+
+  // Now allow a11y service to shutdown.
+  canShutdown = true;
+  // Remove a reference to an accessible object.
+  acc = null;
+  ok(!acc, "Accessible object is removed");
+
+  // Force garbage collection that should now trigger shutdown.
+  forceGC();
+  await a11yShutdown;
+});