issue_comments: 667637217

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https://github.com/pydata/xarray/issues/4285#issuecomment-667637217 https://api.github.com/repos/pydata/xarray/issues/4285 667637217 MDEyOklzc3VlQ29tbWVudDY2NzYzNzIxNw== 6213168 2020-08-02T06:56:23Z 2020-08-02T06:56:23Z MEMBER

I think that xarray should offer a "compatibility test toolkit" to any numpy-like, NEP18-compatible library that wants to integrate with it. Instead of having a module full of tests specifically for pint, one for sparse, one for cupy, one for awkward, etc. etc. etc. those projects could just write a minimal test module like this:

```python import xarray import sparse

xarray.testing.test_nep18_module( sparse, # TODO: lambda to create an array # TODO: list of xfails ) ``` which would automatically expand into a comprehensive suite of tests thanks to pytest parameterize/fixture magic. this would allow developers of numpy-like libraries to just test their package vs what's expected from a generic NEP-18 compliant package.

 
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