[BUG] Some slow tests fail locally

[alessandrofelder]

Describe the bug
Slow, local tests (not run on CI) fail locally.

To Reproduce
Clone this repo, then

conda create -n test python=3.11
pip install -e .[dev]
pytest --runslow --runlocal

on local Ubuntu desktop gives:

FAILED tests/test_gui.py::test_simple_launch - TypeError: 'PySide2.QtCore.Qt.WindowType' object cannot be interpreted as an integer
FAILED tests/test_integration.py::test_animation - OSError: [Errno 39] Directory not empty: '/home/alessandro/dev/brainrender/tests/examples'
FAILED tests/test_streamlines.py::test_download - TypeError: object of type 'NoneType' has no len()
FAILED tests/test_streamlines.py::test_download_slow - TypeError: object of type 'NoneType' has no len()
FAILED tests/test_streamlines.py::test_streamlines - TypeError: 'NoneType' object is not subscriptable

Expected behaviour
Tests pass

Log file
NA

Screenshots
NA

Computer used (please complete the following information):
Ubuntu 22.04

Additional context
NA

[alessandrofelder]

• test_gui::test_simple_launch now fixed, presumably thanks to switching to pyqt5 backend
• Hypothesised cause of test_integration::test_animation merging of test and example data (see examples/video.py)

[adamltyson]

The remaining tests seem to be failing due to #266

[alessandrofelder]

The remaining tests seem to be failing due to #266

Agreed, closing.