Running under a different resolution may prevent the test from working:
$ MIR_SERVER_X11_OUTPUT=1920x1080 pytest 'test_screencopy_bandwidth.py::TestScreencopyBandwidth::test_app_dragged_around[mir_test_tools]'
# ...
E AssertionError: expected to capture at least 16 frames, but only got 2
E assert 2 >= 16
Running under a different resolution may prevent the test from working: