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This paper develops automated testing and debugging techniques for answer set solver development. The paper describes a flexible grammar-based black-box ASP fuzz testing tool which is able to reveal various defects such as unsound and incomplete behavior, i.e. invalid answer sets and inability to find existing solutions, in state-of-the-art answer set solver implementations. Moreover, the paper develops delta debugging techniques for shrinking failure inducing inputs on which solvers exhibit defective behavior. In particular, the paper develops a delta debugging algorithm in the context of answer set solving, and evaluates two different elimination strategies for the algorithm.
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