nbval
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Handle missing expected errors better
- Better error message for missing error in output compare.
- Fail cell if an unrun cell with an expected error does not produce one.
cc @mgeier, xref #108.
Toggled PR to kick appveyor...
I think given Python 3.4 is now deprecated and it only fails with that version, this can probably be merged.
Fine by me to drop 3.4 - do you want to make a separate PR dropping tests on 3.4, then we can merge that first?
Sounds good, I'll make the pull request :)