1 files changed, 56 insertions, 0 deletions
diff --git a/toolkit/components/alerts/test/browser_bug1682866.js b/toolkit/components/alerts/test/browser_bug1682866.js
new file mode 100644
index 0000000000..7ac776d5b5
--- /dev/null
+++ b/toolkit/components/alerts/test/browser_bug1682866.js
@@ -0,0 +1,56 @@
+const baseURL = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "http://example.com"
+);
+
+const alertURL = `${baseURL}file_bug1682866.html`;
+
+add_task(async function testAlertForceClosed() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    alertURL,
+    true /* waitForLoad */
+  );
+
+  // Open a second which is in the same process as tab
+  let secondTabIsLoaded = BrowserTestUtils.waitForNewTab(
+    gBrowser,
+    alertURL,
+    true,
+    false
+  );
+
+  let isSuspendedAfterAlert = await SpecialPowers.spawn(
+    tab.linkedBrowser.browsingContext,
+    [alertURL],
+    url => {
+      content.open(url);
+      var utils = SpecialPowers.getDOMWindowUtils(content);
+      return utils.isInputTaskManagerSuspended;
+    }
+  );
+
+  await secondTabIsLoaded;
+
+  let secondTab = gBrowser.tabs[2];
+
+  is(
+    isSuspendedAfterAlert,
+    Services.prefs.getBoolPref("dom.input_events.canSuspendInBCG.enabled"),
+    "InputTaskManager should be suspended because alert is opened"
+  );
+
+  let alertClosed = BrowserTestUtils.waitForEvent(
+    tab.linkedBrowser,
+    "DOMModalDialogClosed"
+  );
+
+  BrowserTestUtils.loadURIString(tab.linkedBrowser, "about:newtab");
+
+  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
+
+  await alertClosed;
+
+  gBrowser.removeTab(tab);
+  gBrowser.removeTab(secondTab);
+});