Flaky GUI tests

[drew2a]

I'm trying to find flaky tests in the Tribler test suite by using this tool: https://github.com/dropbox/pytest-flakefinder

Here is the description of the experiment: Each test was run 50 times (no parallel), using macOS as the operating system and Python version 3.9.6.

no UI

➜ pytest src/tribler/gui --flake-finder

======================================================== short test summary info ========================================================
FAILED src/tribler/gui/tests/test_core_manager.py::test_on_core_read_ready_os_error_suppressed[41] - assert 4 == 2
===================================== 49 failed, 2901 passed, 950 skipped, 7802 warnings in 33.59s ======================================

UI

➜ pytest src/tribler/gui --flake-finder

======================================================== short test summary info ========================================================
FAILED src/tribler/gui/tests/test_gui.py::test_add_download_url[6] - tribler.gui.tests.test_gui.TimeoutException: Variable downloads_page.downloads within 10 seconds
FAILED src/tribler/gui/tests/test_gui.py::test_discovered_page[42] - tribler.gui.tests.test_gui.TimeoutException: The list was not populated within 10 seconds
FAILED src/tribler/gui/tests/test_gui.py::test_add_deeptorrent[31] - AssertionError: assert not {'AttributeError'}
FAILED src/tribler/gui/tests/test_gui.py::test_tags_dialog[43] - assert []
====================================== 144 failed, 806 passed, 1903 warnings in 3192.56s (0:53:12) ======================================

This issue is related to #7132 and #7134

[drew2a]

I'm closing this issue as it appears that everything fixable has already been addressed. For any new detections of frozen tests, please refer to the registry at #7706. For new flaky tests, feel free to open a separate issue.