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/5288#issuecomment-840398106,https://api.github.com/repos/pydata/xarray/issues/5288,840398106,MDEyOklzc3VlQ29tbWVudDg0MDM5ODEwNg==,10194086,2021-05-13T08:12:11Z,2021-05-13T08:12:11Z,MEMBER,"Sorry I wasn't entirely clear - I meant ""the tests belong in this general vicinity"" - could you put them in their own function? You can also give yourself credit by adding something to whats-new (up to you).","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,885038560
https://github.com/pydata/xarray/pull/5288#issuecomment-838778708,https://api.github.com/repos/pydata/xarray/issues/5288,838778708,MDEyOklzc3VlQ29tbWVudDgzODc3ODcwOA==,10194086,2021-05-11T16:22:12Z,2021-05-11T16:22:12Z,MEMBER,"Looks good, thanks. As usual a test would be superb! You can add a new test in

https://github.com/pydata/xarray/blob/44f4ae11019ca9c9e7280c41d9d2fd86cf86ccce/xarray/tests/test_coding_times.py#L816

It can be as easy as

```python
with pytest.raises(ValueError, match=""invalid reference date""):
    xr.coding.times.encode_cf_datetime([1, 2, 3], units='days since NO_YEAR')
```




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