Compositional dynamic test generation can achieve significant
scalability by memoizing symbolic execution sub-paths as test
summaries. In this paper, we formulate the problem of statically
validating symbolic test summaries against code changes. Summaries
that can be proved still valid using a static analysis of a new program
version do not need to be retested or recomputed dynamically. In the
presence of small code changes, incrementality can considerably speed
up regression testing since static checking is much cheaper than
dynamic checking and testing. We provide several checks ranging from
simple syntactic ones to ones that use a theorem prover. We present
preliminary experimental results comparing these approaches on three
large Windows applications.