1 files changed, 70 insertions, 0 deletions
diff --git a/accessible/tests/browser/browser_shutdown_proxy_acc_reference.js b/accessible/tests/browser/browser_shutdown_proxy_acc_reference.js
new file mode 100644
index 0000000000..7144cff019
--- /dev/null
+++ b/accessible/tests/browser/browser_shutdown_proxy_acc_reference.js
@@ -0,0 +1,70 @@
+/* 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 () {
+  const [a11yInitObserver, a11yInit] = initAccService();
+  await a11yInitObserver;
+
+  let accService = Cc["@mozilla.org/accessibilityService;1"].getService(
+    Ci.nsIAccessibilityService
+  );
+  ok(accService, "Service initialized");
+  await a11yInit;
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: `data:text/html,
+      <html>
+        <head>
+          <meta charset="utf-8"/>
+          <title>Accessibility Test</title>
+        </head>
+        <body><div id="div" style="visibility: hidden;"></div></body>
+      </html>`,
+    },
+    async function (browser) {
+      let onShow = waitForEvent(Ci.nsIAccessibleEvent.EVENT_SHOW, "div");
+      await invokeSetStyle(browser, "div", "visibility", "visible");
+      let showEvent = await onShow;
+      let divAcc = showEvent.accessible;
+      ok(divAcc, "Accessible proxy is created");
+      // Remove unnecessary dangling references
+      onShow = null;
+      showEvent = null;
+      forceGC();
+
+      let canShutdown = false;
+      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 proxy.
+      forceGC();
+      // Have some breathing room when removing a11y service references.
+      await TestUtils.waitForTick();
+
+      // Now allow a11y service to shutdown.
+      canShutdown = true;
+      // Remove a last reference to an accessible proxy.
+      divAcc = null;
+      ok(!divAcc, "Accessible proxy is removed");
+
+      // Force garbage collection that should now trigger shutdown.
+      forceGC();
+      await a11yShutdown;
+    }
+  );
+});