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Methodological guidelines for object-oriented software construction that improve the reliability of the resulting software systems are presented. It is shown that the object-oriented techniques rely on the theory of design by contract, which underlies the design of the Eiffel analysis, design, and programming language and of the supporting libraries, from(More)
Intuition is often not a good guide to know which testing strategies will work best. There is no substitute for experimental analysis based on objective criteria: how many faults a strategy finds, and how fast. "Random" testing is an example of an idea that intuitively seems simplistic or even dumb, but when assessed through such criteria can yield better(More)
In program debugging, finding a failing run is only the first step; what about correcting the fault? Can we automate the second task as well as the first? The AutoFix-E tool automatically generates and validates fixes for software faults. The key insights behind AutoFix-E are to rely on contracts present in the software to ensure that the proposed fixes are(More)
Since test cases cannot be exhaustive, any effective test case generation strategy must identify the execution states most likely to uncover bugs. The key issue is to define criteria for selecting such interesting states. If the units being tested are classes in object-oriented programming, it seems attractive to rely on the boolean queries present in each(More)