1 files changed, 36 insertions, 0 deletions
diff --git a/js/xpconnect/tests/browser/browser_dead_object.js b/js/xpconnect/tests/browser/browser_dead_object.js
new file mode 100644
index 0000000000..b8b2dd0688
--- /dev/null
+++ b/js/xpconnect/tests/browser/browser_dead_object.js
@@ -0,0 +1,36 @@
+/* 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/.
+ */
+
+// For bug 773980, test that Components.utils.isDeadWrapper works as expected.
+
+add_task(async function test() {
+  const url =
+    "http://mochi.test:8888/browser/js/xpconnect/tests/browser/browser_deadObjectOnUnload.html";
+  let newTab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  let browser = gBrowser.selectedBrowser;
+  let innerWindowId = browser.innerWindowID;
+  let contentDocDead = await ContentTask.spawn(
+    browser,
+    { innerWindowId },
+    async function (args) {
+      let doc = content.document;
+      let { TestUtils } = ChromeUtils.importESModule(
+        "resource://testing-common/TestUtils.sys.mjs"
+      );
+      let promise = TestUtils.topicObserved(
+        "inner-window-nuked",
+        (subject, data) => {
+          let id = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
+          return id == args.innerWindowId;
+        }
+      );
+      content.location = "http://mochi.test:8888/";
+      await promise;
+      return Cu.isDeadWrapper(doc);
+    }
+  );
+  is(contentDocDead, true, "wrapper is dead");
+  BrowserTestUtils.removeTab(newTab);
+});