id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
519490511,MDExOlB1bGxSZXF1ZXN0MzM4MjIzNTk1,3493,Tests for module-level functions with units,14808389,closed,0,,,8,2019-11-07T20:20:33Z,2019-11-15T14:49:33Z,2019-11-14T01:24:08Z,MEMBER,,0,pydata/xarray/pulls/3493,"This PR adds tests that cover the module level functions of the public API, similar to #3238 and #3447.
 - [x] Tests added
 - [x] Passes `black . && mypy . && flake8`
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API

As a reference for myself, these are the functions listed by the docs:
* [x] `apply_ufunc`
* [x] `align`
* [x] `broadcast`
* [x] `concat`
* [x] `merge`
* [x] `combine_by_coords`
* [x] `combine_nested`
* [ ] <strike>`auto_combine` (deprecated)</strike>
* [x] masking / selecting: `where`
* [x] replication: `full_like`, `ones_like`, `zeros_like`
* [x] `dot`
* [ ] <strike>`map_blocks`</strike>

Functions not covered by this PR:
* `auto_combine` (deprecated)
* `map_blocks` (dask specific, should be the same as `apply_ufunc` without dask)
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