1 files changed, 54 insertions, 0 deletions
diff --git a/remote/cdp/test/browser/page/browser_javascriptDialog_beforeunload.js b/remote/cdp/test/browser/page/browser_javascriptDialog_beforeunload.js
new file mode 100644
index 0000000000..7cab579e2c
--- /dev/null
+++ b/remote/cdp/test/browser/page/browser_javascriptDialog_beforeunload.js
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test beforeunload dialog events.
+add_task(async function ({ client, tab }) {
+  info("Allow to trigger onbeforeunload without user interaction");
+  await new Promise(resolve => {
+    const options = {
+      set: [["dom.require_user_interaction_for_beforeunload", false]],
+    };
+    SpecialPowers.pushPrefEnv(options, resolve);
+  });
+
+  const { Page } = client;
+
+  info("Enable the page domain");
+  await Page.enable();
+
+  info("Attach a valid onbeforeunload handler");
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    content.onbeforeunload = () => true;
+  });
+
+  info("Trigger the beforeunload again but reject the prompt");
+  const { type } = await triggerBeforeUnload(Page, tab, false);
+  is(type, "beforeunload", "dialog event contains the correct type");
+
+  info("Trigger the beforeunload again and accept the prompt");
+  const onTabClose = BrowserTestUtils.waitForEvent(tab, "TabClose");
+  await triggerBeforeUnload(Page, tab, true);
+
+  info("Wait for the TabClose event");
+  await onTabClose;
+});
+
+function triggerBeforeUnload(Page, tab, accept) {
+  // We use then here because after clicking on the close button, nothing
+  // in the main block of the function will be executed until the prompt
+  // is accepted or rejected. Attaching a then to this promise still works.
+
+  const onDialogOpen = Page.javascriptDialogOpening().then(
+    async dialogEvent => {
+      await Page.handleJavaScriptDialog({ accept });
+      return dialogEvent;
+    }
+  );
+
+  info("Click on the tab close icon");
+  tab.closeButton.click();
+
+  return onDialogOpen;
+}