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
192752746,MDExOlB1bGxSZXF1ZXN0OTYwMjUwMTk=,1147,Pytest assert functions,5635139,closed,0,,,20,2016-12-01T04:36:56Z,2016-12-22T19:20:08Z,2016-12-22T19:20:08Z,MEMBER,,0,pydata/xarray/pulls/1147,"Is this a reasonable function to use with py.test? In place of the inheritance `.assertVariableEqual` etc.

- Do we want separate functions for each class?
- There's a comment `or just switch to py.test and add an appropriate hook.` - is that different to what's here?
- This still needs to be completed, with additional functions for `assert _identical` and `assert_approx_equal`.
- Do we want more description for the failure, above just printing the arguments? That can also be added later
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