Running the test suite creates the following zarr files:

./Peninsula.zarr
./MIT_particles_scipy.zarr
./nemo_particles.zarr
./DecayingMovingParticle.zarr
./StommelParticle.zarr
./EddyParticle.zarr
./RadialParticle.zarr
./MIT_particles_jit.zarr

cluttering the working directory. Changing the tests to clean up these files after the tests have run (e.g., by using temporary files) would improve the quality of the test suite.