chore(tests): adding tests for Qt widgets

[jeertmans]

No description provided.

[codecov]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
manim_slides/__init__.py	60.00% <100.00%> (ø)
manim_slides/__main__.py	71.42% <100.00%> (-0.67%)	⬇️
manim_slides/__version__.py	100.00% <100.00%> (ø)
manim_slides/commons.py	96.15% <ø> (ø)
manim_slides/config.py	91.03% <100.00%> (+7.11%)	⬆️
manim_slides/logger.py	100.00% <100.00%> (ø)
manim_slides/qt_utils.py	100.00% <100.00%> (ø)
manim_slides/slide/manimlib.py	100.00% <100.00%> (ø)
manim_slides/present/player.py	81.89% <92.30%> (+5.27%)	⬆️
manim_slides/slide/animation.py	97.56% <97.56%> (ø)
... and 8 more

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