1 files changed, 72 insertions, 0 deletions
diff --git a/dom/ipc/tests/browser_cancel_content_js.js b/dom/ipc/tests/browser_cancel_content_js.js
new file mode 100644
index 0000000000..e33d59792c
--- /dev/null
+++ b/dom/ipc/tests/browser_cancel_content_js.js
@@ -0,0 +1,72 @@
+/* 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";
+
+requestLongerTimeout(10);
+
+const TEST_PAGE =
+  "http://mochi.test:8888/browser/dom/ipc/tests/file_cancel_content_js.html";
+const NEXT_PAGE = "http://mochi.test:8888/browser/dom/ipc/tests/";
+const JS_URI = "javascript:void(document.title = 'foo')";
+
+async function test_navigation(nextPage, cancelContentJSPref, shouldCancel) {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.ipc.cancel_content_js_when_navigating", cancelContentJSPref],
+      ["dom.max_script_run_time", 20],
+      // Force a single process so that the navigation will complete in the same
+      // process as the previous page which is running the long-running script.
+      ["dom.ipc.processCount", 1],
+      ["dom.ipc.processCount.webIsolated", 1],
+    ],
+  });
+  let tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    opening: TEST_PAGE,
+  });
+
+  const loopEnded = ContentTask.spawn(tab.linkedBrowser, [], async function () {
+    await new Promise(resolve => {
+      content.addEventListener("LongLoopEnded", resolve, {
+        once: true,
+      });
+    });
+  });
+
+  // Wait for the test page's long-running JS loop to start.
+  await ContentTask.spawn(tab.linkedBrowser, [], function () {
+    content.dispatchEvent(new content.Event("StartLongLoop"));
+  });
+
+  info(
+    `navigating to ${nextPage} with cancel content JS ${
+      cancelContentJSPref ? "enabled" : "disabled"
+    }`
+  );
+  const nextPageLoaded = BrowserTestUtils.waitForContentEvent(
+    tab.linkedBrowser,
+    "DOMTitleChanged"
+  );
+  BrowserTestUtils.loadURIString(gBrowser, nextPage);
+
+  const result = await Promise.race([
+    nextPageLoaded,
+    loopEnded.then(() => "timeout"),
+  ]);
+
+  const timedOut = result === "timeout";
+  if (shouldCancel) {
+    ok(timedOut === false, "expected next page to be loaded");
+  } else {
+    ok(timedOut === true, "expected timeout");
+  }
+
+  BrowserTestUtils.removeTab(tab);
+}
+
+add_task(async () => test_navigation(NEXT_PAGE, true, true));
+add_task(async () => test_navigation(NEXT_PAGE, false, false));
+add_task(async () => test_navigation(JS_URI, true, false));
+add_task(async () => test_navigation(JS_URI, false, false));