From 3b790f63018cfabc4dae274223baa6649df39d63 Mon Sep 17 00:00:00 2001
From: Olli Pettay <Olli.Pettay@helsinki.fi>
Date: Tue, 25 Jan 2022 11:13:12 +0000
Subject: [PATCH] Bug 1719178 - test, r=peterv

Depends on D119114

Differential Revision: https://phabricator.services.mozilla.com/D119303
---
 docshell/test/browser/browser.ini           |  1 +
 docshell/test/browser/browser_bug1719178.js | 34 +++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 docshell/test/browser/browser_bug1719178.js

diff --git a/docshell/test/browser/browser.ini b/docshell/test/browser/browser.ini
index 58e561406523..a2b9c0538144 100644
--- a/docshell/test/browser/browser.ini
+++ b/docshell/test/browser/browser.ini
@@ -116,6 +116,7 @@ support-files =
 [browser_bug1674464.js]
 https_first_disabled = true
 skip-if = !fission || !crashreporter # On a crash we only keep history when fission is enabled.
+[browser_bug1719178.js]
 [browser_bug234628-1.js]
 [browser_bug234628-10.js]
 [browser_bug234628-11.js]
diff --git a/docshell/test/browser/browser_bug1719178.js b/docshell/test/browser/browser_bug1719178.js
new file mode 100644
index 000000000000..ec42ec79d5cd
--- /dev/null
+++ b/docshell/test/browser/browser_bug1719178.js
@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+SimpleTest.requestFlakyTimeout(
+  "The test needs to let objects die asynchronously."
+);
+
+add_task(async function test_accessing_shistory() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:preferences"
+  );
+  let sh = tab.linkedBrowser.browsingContext.sessionHistory;
+  ok(sh, "Should have SessionHistory object");
+  gBrowser.removeTab(tab);
+  tab = null;
+  for (let i = 0; i < 5; ++i) {
+    SpecialPowers.Services.obs.notifyObservers(
+      null,
+      "memory-pressure",
+      "heap-minimize"
+    );
+    SpecialPowers.DOMWindowUtils.garbageCollect();
+    await new Promise(function(r) {
+      // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+      setTimeout(r, 50);
+    });
+  }
+
+  try {
+    sh.reloadCurrentEntry();
+  } catch (ex) {}
+  ok(true, "This test shouldn't crash.");
+});