Would there be support for moving to pytest as the unit testing framework for Pint over unittest? I think this would be a worthwhile move for a couple reasons:

• pytest's unittest.TestCase support would make it an easy transition
• Parameterized tests in pytest's style would be very useful for some current/upcoming PRs (see WIP: floordiv, mod, divmod #943 #946 (comment), Add tests to ensure internal type is not mutated except in inplace operations #925, Insuring interoperability of pint with other (non-unit) array-like types #845 (comment))
• There's a plugin for matplotlib tests, which would aid Implement tests for matplotlib functionality #897
• It's widely used elsewhere (e.g., NumPy, Dask, xarray, Sparse, MetPy)

@hgrecco What are your thoughts on this?