1 files changed, 75 insertions, 0 deletions
diff --git a/accessible/tests/browser/browser_shutdown_remote_own_reference.js b/accessible/tests/browser/browser_shutdown_remote_own_reference.js
new file mode 100644
index 0000000000..429737a81a
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+++ b/accessible/tests/browser/browser_shutdown_remote_own_reference.js
@@ -0,0 +1,75 @@
+/* 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(function* () {
+  // Making sure that the e10s is enabled on Windows for testing.
+  yield setE10sPrefs();
+
+  yield BrowserTestUtils.withNewTab({
+    gBrowser,
+    url: `data:text/html,
+      <html>
+        <head>
+          <meta charset="utf-8"/>
+          <title>Accessibility Test</title>
+        </head>
+        <body></body>
+      </html>`
+  }, function*(browser) {
+    info('Creating a service in parent and waiting for service to be created ' +
+      'in content');
+    // Create a11y service in the main process. This will trigger creating of
+    // the a11y service in parent as well.
+    let parentA11yInit = initPromise();
+    let contentA11yInit = initPromise(browser);
+    let accService = Cc['@mozilla.org/accessibilityService;1'].getService(
+      Ci.nsIAccessibilityService);
+    ok(accService, 'Service initialized in parent');
+    yield Promise.all([parentA11yInit, contentA11yInit]);
+
+    info('Adding additional reference to accessibility service in content ' +
+      'process');
+    // Add a new reference to the a11y service inside the content process.
+    loadFrameScripts(browser, `let accService = Components.classes[
+      '@mozilla.org/accessibilityService;1'].getService(
+        Components.interfaces.nsIAccessibilityService);`);
+
+    info('Shutting down a service in parent and making sure the one in ' +
+      'content stays alive');
+    let contentCanShutdown = false;
+    let parentA11yShutdown = shutdownPromise();
+    // This promise will resolve only if contentCanShutdown flag is set to true.
+    // If 'a11y-init-or-shutdown' event with '0' flag (in content) comes before
+    // it can be shut down, the promise will reject.
+    let contentA11yShutdown = new Promise((resolve, reject) =>
+      shutdownPromise(browser).then(flag => contentCanShutdown ?
+        resolve() : reject('Accessible service was shut down incorrectly')));
+    // Remove a11y service reference in the main process and force garbage
+    // collection. This should not trigger shutdown in content since a11y
+    // service is used by XPCOM.
+    accService = null;
+    ok(!accService, 'Service is removed in parent');
+    // Force garbage collection that should not trigger shutdown because there
+    // is a reference in a content process.
+    forceGC();
+    loadFrameScripts(browser, `Components.utils.forceGC();`);
+    yield parentA11yShutdown;
+
+    // Have some breathing room between a11y service shutdowns.
+    yield new Promise(resolve => executeSoon(resolve));
+
+    info('Removing a service in content');
+    // Now allow a11y service to shutdown in content.
+    contentCanShutdown = true;
+    // Remove last reference to a11y service in content and force garbage
+    // collection that should trigger shutdown.
+    loadFrameScripts(browser, `accService = null; Components.utils.forceGC();`);
+    yield contentA11yShutdown;
+
+    // Unsetting e10s related preferences.
+    yield unsetE10sPrefs();
+  });
+});