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Question about coverage metric scc and mc/dc

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LegacyForum
LegacyForum Posts: 1,664 ✭✭
edited December 2016 in C/C++test
I think when simple condition coverage(scc) reaches 100%, then the mc/dc will also be 100%, is this correct? if this is not true, does anyone have some code snapshots to illustrate? thanks.
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  • LegacyForum
    LegacyForum Posts: 1,664 ✭✭
    edited May 2006
    Hello skyocean

    Yes, in most circumstances you are correct if you reach 100% simple condition coverage, MC/DC coverage will also be 100% percent. For example, when testing the try.cpp example below, C++Test will automatically generate test cases that will report about 50% simple condition coverage and 0% percent MC/DC coverage. Once a test case is created that will cover all possible conditions ( see test case below), the MC/DC coverage will also be 100% percent.


    -----------------------cut-------------------------
    // try.cpp

    int e; // global function

    void func(int a, int b, int c, int d)
    {
    if (( a < b ) && (c < d) && ((d +c ) < e))
    {

    }
    }
    --------------------------------------------------------


    --------------------------------------------------------
    /* test case to produce 100% coverage */

    /* Pre-condition initialization */

    /* Initializing argument 1 (a) */
    int _a = -1;

    /* Initializing argument 2 (b ) */
    int _b = cpptestLimitsGetMaxInt();

    /* Initializing argument 3 ( c ) */
    int _c = 1;

    /* Initializing argument 4 (d) */
    int _d = 2;

    /* Initializing global variable ::e */
    {
    ::e = 5;
    }

    /* Tested function call */
    ::func(_a, _b, _c, _d);
    --------------------------------------------------------

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