1 files changed, 37 insertions, 0 deletions
diff --git a/docshell/test/browser/browser_frameloader_swap_with_bfcache.js b/docshell/test/browser/browser_frameloader_swap_with_bfcache.js
new file mode 100644
index 0000000000..2f7d494845
--- /dev/null
+++ b/docshell/test/browser/browser_frameloader_swap_with_bfcache.js
@@ -0,0 +1,37 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+add_task(async function test() {
+  if (
+    !SpecialPowers.Services.appinfo.sessionHistoryInParent ||
+    !SpecialPowers.Services.prefs.getBoolPref("fission.bfcacheInParent")
+  ) {
+    ok(
+      true,
+      "This test is currently only for the bfcache in the parent process."
+    );
+    return;
+  }
+  const uri =
+    "data:text/html,<script>onpageshow = function(e) { document.documentElement.setAttribute('persisted', e.persisted); }; </script>";
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, uri, true);
+  let browser1 = tab1.linkedBrowser;
+
+  let tab2 = await BrowserTestUtils.openNewForegroundTab(gBrowser, uri, true);
+  let browser2 = tab2.linkedBrowser;
+  BrowserTestUtils.loadURIString(browser2, uri + "nextpage");
+  await BrowserTestUtils.browserLoaded(browser2, false);
+
+  gBrowser.swapBrowsersAndCloseOther(tab1, tab2);
+  is(tab1.linkedBrowser, browser1, "Tab's browser should stay the same.");
+  browser1.goBack(false);
+  await BrowserTestUtils.browserLoaded(browser1, false);
+  let persisted = await SpecialPowers.spawn(browser1, [], async function () {
+    return content.document.documentElement.getAttribute("persisted");
+  });
+
+  is(persisted, "false", "BFCache should be evicted when swapping browsers.");
+
+  BrowserTestUtils.removeTab(tab1);
+});