The comKorat Tool: Unified Combinatorial and Constraint-Based Generation of Structurally Complex Tests

This tool paper presents comKorat, which unifies constraint-based generation of structurally complex tests with combinatorial testing. Constraint-based test generation is an effective approach for generating structurally complex inputs for systematic testing. While this approach can typically generate large numbers of tests, it has limited scalability – tests generated are usually only up to a small bound on input size. Combinatorial test generation, e.g., pair-wise testing, is a more scalable approach but is challenging to apply on commercial software systems that require complex input structures that cannot be formed by using arbitrary combinations. The comKorat tool integrates Korat and ACTS test generators to generate test suites for large scale commercial systems. This paper presents a case-study of applying comKorat on a software application developed at Yahoo!. The experimental results show that comKorat outperforms existing solution in execution time and finds a total of 23 previously unknown bugs in the application.