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  • Starter property-based test suite · 5 ✖

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374583488 https://github.com/pydata/xarray/pull/1972#issuecomment-374583488 https://api.github.com/repos/pydata/xarray/issues/1972 MDEyOklzc3VlQ29tbWVudDM3NDU4MzQ4OA== fmaussion 10050469 2018-03-20T12:42:37Z 2018-03-20T12:42:37Z MEMBER

Thanks @Zac-HD ! 

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   Starter property-based test suite 303103716
373954379 https://github.com/pydata/xarray/pull/1972#issuecomment-373954379 https://api.github.com/repos/pydata/xarray/issues/1972 MDEyOklzc3VlQ29tbWVudDM3Mzk1NDM3OQ== shoyer 1217238 2018-03-17T21:35:52Z 2018-03-17T21:36:37Z MEMBER

blockers to merging this as-is?

This looks pretty good to me in its current state. I would say we should merge it now and iterate in future PRs.

other APIs you think it would be reasonably easy to write property tests for? Here's a nice list of properties to test 😄

Almost anywhere where we currently make heavy use of parametrize would be a good candidate. Some other possibilities:

  • Consistency with pandas for groupby/rolling aggregations.
  • Roundtrip writing/reading data to netCDF. There are a couple of known exceptions (e.g., dtypes not supported by netCDF and MultiIndex) but otherwise every xarray object should be serializable to netCDF and back without data loss.
  • Roundtrip to/from pandas Series/DataFrame with to_series()/to_dataframe()/to_xarray().
  • Indexing consistency tests for backends: all indexing operations should be supported consistently on data accessed from any backend.
  • NumPy vs Dask: any operation on dask arrays should be consistent with the operation on numpy arrays (e.g., f(xarray_obj.chunk()).compute() == f(xarray_obj)).
  • Indexing followed by xarray.concat: should get back the same result.
  • Binary arithmetic on xarray objects with Python operators (+, -, etc) and NumPy ufuncs (np.add, np.subtract, etc).
 
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   Starter property-based test suite 303103716
371691628 https://github.com/pydata/xarray/pull/1972#issuecomment-371691628 https://api.github.com/repos/pydata/xarray/issues/1972 MDEyOklzc3VlQ29tbWVudDM3MTY5MTYyOA== max-sixty 5635139 2018-03-09T02:18:13Z 2018-03-09T02:18:13Z MEMBER

If we don't want to trigger by default, we can do something like this and require passing this to run them:

pytest --property-tests

 
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   Starter property-based test suite 303103716
371672811 https://github.com/pydata/xarray/pull/1972#issuecomment-371672811 https://api.github.com/repos/pydata/xarray/issues/1972 MDEyOklzc3VlQ29tbWVudDM3MTY3MjgxMQ== shoyer 1217238 2018-03-09T00:31:07Z 2018-03-09T00:31:07Z MEMBER

One thing that comes to mind is organization... would it make sense to put this alongside the current xarray tests, e.g., have xarray/tests/unit and xarray/tests/property?

I guess one downside of this would be that it could change how we need to invoke py.test by default, if we don't want to trigger all the property based tests.

 
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   Starter property-based test suite 303103716
371593519 https://github.com/pydata/xarray/pull/1972#issuecomment-371593519 https://api.github.com/repos/pydata/xarray/issues/1972 MDEyOklzc3VlQ29tbWVudDM3MTU5MzUxOQ== shoyer 1217238 2018-03-08T19:17:48Z 2018-03-08T19:17:48Z MEMBER

This looks like a great start to me -- thank you!

It's impressive that it's possible to break every plotting type with matplotlib :).

 
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