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Using vManager to identify line coverage from a specific test

scottbadi

I have been using the rank feature to identify tests that are redundant in our environment, but then I realized I'd also like to be able to see exactly what coverage goes into increasing the delta_cov value for a given test. If I had a test in my rank report that contributed 0.5% of the delta_cov, how could I got about seeing exactly where that 0.5% was coming from? It seems like that might be part of the correlate function, but I couldn't mange to find a way to see what specific coverage was being contributed for a given test.

  • Hi Scott.

    I don't think there is a built-in way to achieve this directly, however you could do it in a few steps in IMC as follows. Assume you have N runs with a positive rank, and you want to know how which bins were uniquely hit by run N.

    1. Manually merge the coverage for all the runs 1 to N-1

    2. Use the "report_unique -run1 merged -run2 run_N -one_way" to produce a JSON report of the bins that were hit only by run_N.

    Note that these "unique" bins might be hit by other, lower-ranked runs as well; the ranking sorts by the efficiency of the run in terms of how many new bins are hit per CPU second. Don't forget also that any randomisation in the tests may mean that these ranked runs might not produce the same results when you run with the same test+seed combinations after any code changes. Use ranking as an indicator of test quality, but do not use it to produce "golden" test lists that go stale quickly...

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