  Unit testing has been considered as having a key role in building high
quality software, and therefore it has been widely used in practice. However,
data on the relationship between unit testing and aspects of software quality
remain scarce. A survey study with 235 survey responses from seven
organizations was conducted in order to understand the correlation between
practitioners' perception of code quality and unit testing practices. In
addition, we conducted a case study in one of these organizations to
investigate the correlation between unit test coverage and post-unit test
defects. In both cases none or weak correlations were found. We recommend
further research on the effectiveness of different testing practices in order
to help practitioners to understand how to best allocate their resources to the
testing chain.
