5 research outputs found
How to Handle Assumptions in Synthesis
The increased interest in reactive synthesis over the last decade has led to
many improved solutions but also to many new questions. In this paper, we
discuss the question of how to deal with assumptions on environment behavior.
We present four goals that we think should be met and review several different
possibilities that have been proposed. We argue that each of them falls short
in at least one aspect.Comment: In Proceedings SYNT 2014, arXiv:1407.493
Synthesizing Adaptive Test Strategies from Temporal Logic Specifications
Constructing good test cases is difficult and time-consuming, especially if
the system under test is still under development and its exact behavior is not
yet fixed. We propose a new approach to compute test strategies for reactive
systems from a given temporal logic specification using formal methods. The
computed strategies are guaranteed to reveal certain simple faults in every
realization of the specification and for every behavior of the uncontrollable
part of the system's environment. The proposed approach supports different
assumptions on occurrences of faults (ranging from a single transient fault to
a persistent fault) and by default aims at unveiling the weakest one. Based on
well-established hypotheses from fault-based testing, we argue that such tests
are also sensitive for more complex bugs. Since the specification may not
define the system behavior completely, we use reactive synthesis algorithms
with partial information. The computed strategies are adaptive test strategies
that react to behavior at runtime. We work out the underlying theory of
adaptive test strategy synthesis and present experiments for a safety-critical
component of a real-world satellite system. We demonstrate that our approach
can be applied to industrial specifications and that the synthesized test
strategies are capable of detecting bugs that are hard to detect with random
testing