1 files changed, 32 insertions, 0 deletions
diff --git a/docshell/test/browser/browser_bug1769189.js b/docshell/test/browser/browser_bug1769189.js
new file mode 100644
index 0000000000..08cb4f9002
--- /dev/null
+++ b/docshell/test/browser/browser_bug1769189.js
@@ -0,0 +1,32 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_beforeUnload_and_replaceState() {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "data:text/html,<script>window.addEventListener('beforeunload', () => { window.history.replaceState(true, ''); });</script>",
+    },
+    async function (browser) {
+      let initialState = await SpecialPowers.spawn(browser, [], () => {
+        return content.history.state;
+      });
+
+      is(initialState, null, "history.state should be initially null.");
+
+      let awaitPageShow = BrowserTestUtils.waitForContentEvent(
+        browser,
+        "pageshow"
+      );
+      BrowserReload();
+      await awaitPageShow;
+
+      let updatedState = await SpecialPowers.spawn(browser, [], () => {
+        return content.history.state;
+      });
+      is(updatedState, true, "history.state should have been updated.");
+    }
+  );
+});