Alex Petrov created CASSANDRA-13238:
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             Summary: Add actual row output to assertEmpty error message
                 Key: CASSANDRA-13238
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13238
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Alex Petrov
            Priority: Trivial


We have several issues popping up every now and then that are hard to debug and 
the test failure messages aren't entirely helpful, for example: 

{code}
java.lang.AssertionError: Expected empty result but got 1 rows:
{code}

It could be much better if we could have an actual output (what exactly the row 
that got returned appended to it:

{code}
java.lang.AssertionError: Expected empty result but got 1 rows: 
[row(value=null)]
{code}

The nice side-effect of this change is that now we will have a helper method 
that can nicely turn an {{UntypedResultSet}} into {{String}} (I apologise if I 
did overlooked one).



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