Filed by: rmaries [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=320165142&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Qi3mmgb-Q3OSby5f5La9yQ/runs/0/artifacts/public/logs/live_backing.log

[task 2020-10-29T18:39:32.678Z] 18:39:32     INFO - TEST-START | /webdriver/tests/new_window/new_tab.py
[task 2020-10-29T18:39:36.487Z] 18:39:36     INFO - STDOUT: ================ 1 failed, 4 passed, 1 warnings in 3.77 seconds ================
[task 2020-10-29T18:39:36.515Z] 18:39:36     INFO - 
[task 2020-10-29T18:39:36.516Z] 18:39:36     INFO - TEST-PASS | /webdriver/tests/new_window/new_tab.py | test_payload 
[task 2020-10-29T18:39:36.516Z] 18:39:36     INFO - TEST-PASS | /webdriver/tests/new_window/new_tab.py | test_keeps_current_window_handle 
[task 2020-10-29T18:39:36.516Z] 18:39:36     INFO - TEST-PASS | /webdriver/tests/new_window/new_tab.py | test_opens_about_blank_in_new_tab 
[task 2020-10-29T18:39:36.517Z] 18:39:36     INFO - TEST-UNEXPECTED-FAIL | /webdriver/tests/new_window/new_tab.py | test_sets_no_window_name - AssertionError: assert None == ''
[task 2020-10-29T18:39:36.517Z] 18:39:36     INFO - session = <Session 8506eca2-335d-42cb-9a5e-f1416586766e>
[task 2020-10-29T18:39:36.517Z] 18:39:36     INFO - 
[task 2020-10-29T18:39:36.517Z] 18:39:36     INFO -     def test_sets_no_window_name(session):
[task 2020-10-29T18:39:36.517Z] 18:39:36     INFO -         response = new_window(session, type_hint="tab")
[task 2020-10-29T18:39:36.518Z] 18:39:36     INFO -         value = assert_success(response)
[task 2020-10-29T18:39:36.518Z] 18:39:36     INFO -         assert value["type"] == "tab"
[task 2020-10-29T18:39:36.518Z] 18:39:36     INFO -     
[task 2020-10-29T18:39:36.518Z] 18:39:36     INFO -         session.window_handle = value["handle"]
[task 2020-10-29T18:39:36.518Z] 18:39:36     INFO - >       assert window_name(session) == ""
[task 2020-10-29T18:39:36.518Z] 18:39:36     INFO - E       AssertionError: assert None == ''
[task 2020-10-29T18:39:36.519Z] 18:39:36     INFO - E        +  where None = window_name(<Session 8506eca2-335d-42cb-9a5e-f1416586766e>)
[task 2020-10-29T18:39:36.519Z] 18:39:36     INFO - 
[task 2020-10-29T18:39:36.519Z] 18:39:36     INFO - response   = <Responsetatus=200 body={"value": {"type": "tab", "handle": "52"}}>
[task 2020-10-29T18:39:36.519Z] 18:39:36     INFO - session    = <Session 8506eca2-335d-42cb-9a5e-f1416586766e>
[task 2020-10-29T18:39:36.519Z] 18:39:36     INFO - value      = {'handle': '52', 'type': 'tab'}
[task 2020-10-29T18:39:36.519Z] 18:39:36     INFO - 
[task 2020-10-29T18:39:36.519Z] 18:39:36     INFO - tests/web-platform/tests/webdriver/tests/new_window/new_tab.py:55: AssertionError
[task 2020-10-29T18:39:36.520Z] 18:39:36     INFO - .
[task 2020-10-29T18:39:36.520Z] 18:39:36     INFO - TEST-OK | /webdriver/tests/new_window/new_tab.py | took 3835ms
[task 2020-10-29T18:39:36.556Z] 18:39:36     INFO - Closing logging queue
[task 2020-10-29T18:39:36.556Z] 18:39:36     INFO - queue closed
[task 2020-10-29T18:39:36.558Z] 18:39:36     INFO - Starting runner
[task 2020-10-29T18:39:36.571Z] 18:39:36     INFO - PID 1814 | 1603996776568	geckodriver	INFO	Listening on 127.0.0.1:42220
[task 2020-10-29T18:39:36.572Z] 18:39:36     INFO - WebDriver HTTP server listening at http://127.0.0.1:42220/```