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    <p>The following <a href="http://www.dcs.kcl.ac.uk/staff/zheng/scam/scam2009/papers/Alves_slides.pdf" rel="nofollow noreferrer">presentation</a> discusses how to compute the program slice executed by a unit test. It answers the question of, "can you determine the test coverage without executing the program?" and basically sketches the idea you described... with the additional bit of work to actually implement it.</p> <p>You might note that computing a program slice isn't a computationally cheap task. I'd guess that computing a slice (a symbolic computation) is generally slower than executing a unit test, so I'm not sure that you'll save any time doing this. And a slice is a <em>conservative</em> approximation of the affected part of the program, so the answer you get back will include program parts that actually don't get executed.</p> <p>You might be better off instead to run all those 50,000 unit tests once, and collect the coverage data for each one. In this case, when some code fragment is updated, it is possible to determine statically whether the code a particular test executes includes the code you changed or not, and thus you can identify tests that have to be executed again. You can skip executing the rest of the tests.</p> <p>My company builds a <a href="http://www.semanticdesigns.com/Products/TestCoverage" rel="nofollow noreferrer">family of test coverage tools</a>. Our next release of these tools will have this kind of incremental regression testing capability.</p>
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