As part of the import time investigations I have been doing regarding #9324 and #9325 I also noticed that cupy.testing adds significant testing overhead in environments where pytest is installed. I considered making the pytest import lazy or trying to hide its cost in other ways, but ultimately I decided that since most users of cupy do not need the testing module directly the best option would be to make the testing module import in cupy's __init__.py lazy and hide all of the overhead. The module load is fast enough that for users actually accessing the testing module the first attribute access (which triggers the load, and is therefore made slower by making this module load lazy) is still less than 0.1 s so it doesn't degrade that experience much (in exchange for making the majority use case of importing cupy without using testing faster).