Assertion error messages aren't very useful

[db434]

Compare numpy's error messages:

>>> numpy.testing.assert_allclose([1, 2], [1, 3])
AssertionError:
Not equal to tolerance rtol=1e-07, atol=0

Mismatched elements: 1 / 2 (50%)
Max absolute difference: 1
Max relative difference: 0.33333333
 x: array([1, 2])
 y: array([1, 3])

With unyt's:

>>> unyt.testing.assert_allclose_units([1, 2] * unyt.m, [1, 3] * unyt.m)
AssertionError

Is there any appetite for aligning these better, to expose more information when something goes wrong? I'm happy to contribute here - we have something like this internally already.

[neutrinoceros]

Yes. Definitely. There have been improvements in how numpy.testing functions integrate with unyt, but no effort was spent on improving our own. I would love to see this sort of contribution. Thank you for offering !