Dashboard link missing at the start of pytest runs in multithreaded mode #1529
Description
Dashboard link missing at the start of pytest runs in multithreaded mode
Normally, when running tests with --dashboard set, you'll see the link to the dashboard at the start of the test run. Eg:
pytest --dashboard --html=report.html -v --headless --sjw --pls=none --rs
======================================= test session starts ========================================
platform darwin -- Python 3.10.5, pytest-7.1.3, pluggy-1.0.0 -- /Users/michael/.virtualenvs/sbase10/bin/python
metadata: {'Python': '3.10.5', 'Platform': 'macOS-10.14.6-x86_64-i386-64bit', 'Packages': {'pytest': '7.1.3', 'py': '1.11.0', 'pluggy': '1.0.0'}, 'Plugins': {'html': '2.0.1', 'xdist': '2.5.0', 'forked': '1.4.0', 'rerunfailures': '10.2', 'ordering': '0.6', 'cov': '3.0.0', 'metadata': '2.0.2', 'seleniumbase': '4.4.4'}}
rootdir: /Users/michael/github/SeleniumBase/examples, configfile: pytest.ini
plugins: html-2.0.1, xdist-2.5.0, forked-1.4.0, rerunfailures-10.2, ordering-0.6, cov-3.0.0, metadata-2.0.2, seleniumbase-4.4.4
collected 137 items
Dashboard: /Users/michael/github/SeleniumBase/examples/dashboard.html
*********************************************************************
...However, if running tests in multithreaded mode (-n 4, for example) then the Dashboard link is missing:
pytest -n 4 --dashboard --rs -v --headless --html=report.html --pls=none --sjw
======================================= test session starts ========================================
platform darwin -- Python 3.10.5, pytest-7.1.3, pluggy-1.0.0 -- /Users/michael/.virtualenvs/sbase10/bin/python
metadata: {'Python': '3.10.5', 'Platform': 'macOS-10.14.6-x86_64-i386-64bit', 'Packages': {'pytest': '7.1.3', 'py': '1.11.0', 'pluggy': '1.0.0'}, 'Plugins': {'html': '2.0.1', 'xdist': '2.5.0', 'forked': '1.4.0', 'rerunfailures': '10.2', 'ordering': '0.6', 'cov': '3.0.0', 'metadata': '2.0.2', 'seleniumbase': '4.3.8'}}
rootdir: /Users/michael/github/SeleniumBase/examples, configfile: pytest.ini
plugins: html-2.0.1, xdist-2.5.0, forked-1.4.0, rerunfailures-10.2, ordering-0.6, cov-3.0.0, metadata-2.0.2, seleniumbase-4.3.8
[gw0] darwin Python 3.10.5 cwd: /Users/michael/github/SeleniumBase/examples
[gw1] darwin Python 3.10.5 cwd: /Users/michael/github/SeleniumBase/examples
[gw2] darwin Python 3.10.5 cwd: /Users/michael/github/SeleniumBase/examples
[gw3] darwin Python 3.10.5 cwd: /Users/michael/github/SeleniumBase/examples
[gw0] Python 3.10.5 (v3.10.5:f377153967, Jun 6 2022, 12:36:10) [Clang 13.0.0 (clang-1300.0.29.30)]
[gw1] Python 3.10.5 (v3.10.5:f377153967, Jun 6 2022, 12:36:10) [Clang 13.0.0 (clang-1300.0.29.30)]
[gw2] Python 3.10.5 (v3.10.5:f377153967, Jun 6 2022, 12:36:10) [Clang 13.0.0 (clang-1300.0.29.30)]
[gw3] Python 3.10.5 (v3.10.5:f377153967, Jun 6 2022, 12:36:10) [Clang 13.0.0 (clang-1300.0.29.30)]
gw0 [137] / gw1 [137] / gw2 [137] / gw3 [137]
scheduling tests via LoadScheduling
...And the reason this happens is because multithreaded mode captures the output of standard print statements by default.
The fix would involve swapping print() statements with sys.stderr.write(), which works in multithreaded mode.