tests/test.py: Move plan execution logic into TestPlan.run() where it belongs
tests/test.py: Move plan execution logic into TestPlan.run() where it belongs

niklaskorz/pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet