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Given some test case, a program fails. Which part of the test case is responsible for the particular failure? We show how our delta debugging algorithm generalizes and simplifies some failing input to a minimal test case that produces the failure.In a case study, the Mozilla web browser crashed after 95 user actions. Our prototype implementation automatically simplified the input to 3 relevant user actions. Likewise, it simplified 896~lines of HTML to the single line that caused the failure. The case study required 139 automated test runs, or 35 minutes on a 500 MHz PC.
Taking earlier delta debugging technique for source code and applying it to test cases to find the minimum test case component that is required to generate the erroneous output. Examples include C code as input (as well as parameters to CLI program - GCC) but treated as character array as would be expected for this type of test case analysis. Doesn't guarantee minimum failing test case due to size of problem space to search.
Future work points to maximising passing cases as useful to finding defects with these augmented test cases.
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