The database is a critical component of many modern software applications. Recent reports indicate that the vast majority of database use occurs from within an application program. Indeed, database-centric applications have been implemented to create digital libraries, scientific data repositories, and electronic commerce applications. However, a database-centric application is very different from a traditional software system because it interacts with a database that has a complex state and structure. This dissertation formulates a comprehensive framework to address the challenges that are associated with the efficient and effective testing of database-centric applications. The database-aware approach to testing includes: (i) a fault model, (ii) several unified representations of a program’s database interactions, (iii) a family of test adequacy criteria, (iv) a test coverage monitoring component, and (v) tools for reducing and re-ordering a test suite during regression testing.
This dissertation analyzes the worst-case time complexity of every important testing algorithm. This analysis is complemented by experiments that measure the efficiency and effectiveness of the database-aware testing techniques. Each tool is evaluated by using it to test six database-centric applications. The experiments show that the database-aware representations can be constructed with moderate time and space overhead. The adequacy criteria call for test suites to cover 20% more requirements than traditional criteria and this ensures the accurate assessment of test suite quality. It is possible to enumerate data flow-based test requirements in less than one minute and coverage tree path requirements are normally identified in no more than ten seconds. The experimental results also indicate that the coverage monitor can insert instrumentation probes into all six of the applications in fewer than ten seconds. Although instrumentation may moderately increase the static space overhead of an application, the coverage monitoring techniques only increase testing time by 55% on average. A coverage tree often can be stored in less than five seconds even though the coverage report may consume up to twenty-five megabytes of storage. The regression tester usually reduces or prioritizes a test suite in under five seconds. The experiments also demonstrate that the modified test suite is frequently more streamlined than the initial tests.
Kapfhammer, G. M. (2007). A comprehensive framework for testing database-centric applications [PhD Dissertation]. Department of Computer Science, University of Pittsburgh.
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