html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/pull/4089#issuecomment-633922774,https://api.github.com/repos/pydata/xarray/issues/4089,633922774,MDEyOklzc3VlQ29tbWVudDYzMzkyMjc3NA==,14808389,2020-05-26T09:43:29Z,2020-05-26T09:43:29Z,MEMBER,thanks. Do you want to put in a PR fixing that?,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,623751213
https://github.com/pydata/xarray/pull/4089#issuecomment-633310925,https://api.github.com/repos/pydata/xarray/issues/4089,633310925,MDEyOklzc3VlQ29tbWVudDYzMzMxMDkyNQ==,14808389,2020-05-24T22:38:54Z,2020-05-24T22:38:54Z,MEMBER,"no worries about `hypothesis`, that's something we can add in a new PR.

Also, I don't think there is a `hypothesis.extra.xarray` module, yet. Any comments on that, @Zac-HD?","{""total_count"": 1, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 1, ""rocket"": 0, ""eyes"": 0}",,623751213
https://github.com/pydata/xarray/pull/4089#issuecomment-633216248,https://api.github.com/repos/pydata/xarray/issues/4089,633216248,MDEyOklzc3VlQ29tbWVudDYzMzIxNjI0OA==,14808389,2020-05-24T11:22:42Z,2020-05-24T12:09:51Z,MEMBER,"If you want to test individual values without reimplementing the function in the tests (which is what I suspect comparing with the result of `np.cov` would require), that might be the only way.

If not, you could also check properties of covariance / correlation matrices, e.g. that `assert_allclose(xr.cov(a, b) / (a.std() * b.std()), xr.corr(a, b))` (I'm not sure if I remember that formula correctly) or that the diagonal of the auto-covariance matrix is the same as the variance of the array (with a 1D vector, not sure about more dimensions).
If you decide to test using properties, you could also extend our small collection of tests using `hypothesis` (see #1846).","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,623751213