issue_comments: 216338679

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https://github.com/pydata/xarray/pull/837#issuecomment-216338679 https://api.github.com/repos/pydata/xarray/issues/837 216338679 MDEyOklzc3VlQ29tbWVudDIxNjMzODY3OQ== 5384661 2016-05-02T19:35:04Z 2016-05-02T19:35:04Z CONTRIBUTOR

I simplified the test - please feel free to do further edits, also added doc string explaining what the test checks for - essentially it checks if DataArray subtraction behaves correctly when dimension is a structured numpy array. 

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