. If weaker assertions
are specified, erroneous states induced by the test execution
do not necessarily cause assertion violations, leading to
false negatives. Detecting these false negatives is challenging
since the insufficiently written PUTs would just pass. In
this paper, we propose a novel mutation analysis approach
for analyzing PUTs written by developers and identifying
likely locations in PUTs for improvement. The proposed
approach is a first step towards helping developers write
better PUTs in practice.