Bug: Intermittent browser/components/sidebar/tests/browser/browser_vertical_tabs.js | single tracking bug
Status: NEW
Priority: P3
Created: 2024-10-04 02:17:01+00:00
Resolved: 2025-03-03 06:32:11+00:00

**Filed by:** tszentpeteri [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=476774224&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/SAcu-WtRQNKACN7PESCJGg/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2024-10-04T01:00:39.164Z] 01:00:39     INFO - TEST-PASS | browser/components/sidebar/tests/browser/browser_vertical_tabs.js | sidebar.revamp pref is also enabled after we've enabled vertical tabs. - 
[task 2024-10-04T01:00:39.164Z] 01:00:39     INFO - Leaving test bound test_enabling_vertical_tabs_enables_sidebar_revamp
[task 2024-10-04T01:00:39.165Z] 01:00:39     INFO - Entering test bound test_vertical_tabs_overflow
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO - Restoring to browserState: {
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -   "windows": [
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -     {
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -       "tabs": [
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -         {
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -           "entries": [
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -             {
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -               "url": "data:,Tab0",
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -               "triggeringPrincipal_base64": "eyIzIjp7fX0="
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -             }
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -           ]
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -         },
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -         {
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -           "entries": [
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -             {
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -               "url": "data:,Tab1",
[task 2024-10-04T01:00:39.174Z] 01:00:39     INFO -               "triggeringPrincipal_base64": "eyIzIjp7fX0="
<...>
[task 2024-10-04T01:00:39.193Z] 01:00:39     INFO - running 
[task 2024-10-04T01:00:39.193Z] 01:00:39     INFO - Windows and tabs opened, waiting for readyWindowsPromise
[task 2024-10-04T01:00:39.194Z] 01:00:39     INFO - readyWindowsPromise resolved
[task 2024-10-04T01:00:39.194Z] 01:00:39     INFO - Open a new tab using the new tab button.
[task 2024-10-04T01:00:39.195Z] 01:00:39     INFO - Buffered messages finished
[task 2024-10-04T01:00:39.195Z] 01:00:39     INFO - TEST-UNEXPECTED-FAIL | browser/components/sidebar/tests/browser/browser_vertical_tabs.js | New tab button is visible while tabs are overflowing. - 
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - Stack trace:
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:test_ok:1597
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - chrome://mochitests/content/browser/browser/components/sidebar/tests/browser/browser_vertical_tabs.js:test_vertical_tabs_overflow:386
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:handleTask:1145
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1217
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1358
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1134
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2024-10-04T01:00:39.196Z] 01:00:39     INFO - Not taking screenshot here: see the one that was previously logged
[task 2024-10-04T01:00:39.197Z] 01:00:39     INFO - TEST-UNEXPECTED-FAIL | browser/components/sidebar/tests/browser/browser_vertical_tabs.js | Tabstrip now has 51 tabs. - Got 50, expected 51
[task 2024-10-04T01:00:39.197Z] 01:00:39     INFO - Stack trace:
[task 2024-10-04T01:00:39.197Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:test_is:1625
[task 2024-10-04T01:00:39.197Z] 01:00:39     INFO - chrome://mochitests/content/browser/browser/components/sidebar/tests/browser/browser_vertical_tabs.js:test_vertical_tabs_overflow:392
[task 2024-10-04T01:00:39.197Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:handleTask:1145
[task 2024-10-04T01:00:39.198Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1217
[task 2024-10-04T01:00:39.198Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1358
[task 2024-10-04T01:00:39.198Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1134
[task 2024-10-04T01:00:39.198Z] 01:00:39     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2024-10-04T01:00:39.198Z] 01:00:39     INFO - TEST-PASS | browser/components/sidebar/tests/browser/browser_vertical_tabs.js | browser.ui.interaction.vertical_tabs_container must be recorded. - true == true - 
[task 2024-10-04T01:00:39.199Z] 01:00:39     INFO - Not taking screenshot here: see the one that was previously logged
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - TEST-UNEXPECTED-FAIL | browser/components/sidebar/tests/browser/browser_vertical_tabs.js | browser.ui.interaction.vertical_tabs_container must contain the 'vertical-tabs-newtab-button' key. - false == true - 
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - Stack trace:
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - resource://testing-common/TelemetryTestUtils.sys.mjs:assertKeyedScalar:43
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - chrome://mochitests/content/browser/browser/components/sidebar/tests/browser/browser_vertical_tabs.js:test_vertical_tabs_overflow:398
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:handleTask:1145
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1217
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1358
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1134
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2024-10-04T01:00:39.200Z] 01:00:39     INFO - Not taking screenshot here: see the one that was previously logged
[task 2024-10-04T01:00:39.201Z] 01:00:39     INFO - TEST-UNEXPECTED-FAIL | browser/components/sidebar/tests/browser/browser_vertical_tabs.js | browser.ui.interaction.vertical_tabs_container['vertical-tabs-newtab-button'] must contain the expected value - "undefined" == 1 - 
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - Stack trace:
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - resource://testing-common/TelemetryTestUtils.sys.mjs:assertKeyedScalar:47
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - chrome://mochitests/content/browser/browser/components/sidebar/tests/browser/browser_vertical_tabs.js:test_vertical_tabs_overflow:398
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:handleTask:1145
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1217
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1358
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1134
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2024-10-04T01:00:39.202Z] 01:00:39     INFO - Leaving test bound test_vertical_tabs_overflow
[task 2024-10-04T01:00:41.984Z] 01:00:41     INFO - GECKO(1910) | MEMORY STAT | vsize 17159MB | residentFast 751MB | heapAllocated 423MB
[task 2024-10-04T01:00:41.985Z] 01:00:41     INFO - TEST-OK | browser/components/sidebar/tests/browser/browser_vertical_tabs.js | took 3919ms
[task 2024-10-04T01:00:41.992Z] 01:00:41     INFO - checking window state
[task 2024-10-04T01:00:41.996Z] 01:00:41     INFO - TEST-START | browser/components/sidebar/tests/browser/browser_vertical_tabs_cui_reset.js
```