Github user Madhuka commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/152#issuecomment-133631065
@eranwitkon It is been fixed few days ago. Please update your copy.
Now there is data validator. So when you pass 1 column test will fail.
Since Zeppelin currently doesn't have notifications you will not see any
messages in UI as notification. But the error messages will be printed on the
console. Please see that. (There is a separate PR for notifications.)
Further if you are interested about data validator visit the documentation.
#203
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