Add a "make verify_coverage" target generation coverage info. Use lcov/gcov to gather coverage info for the tests (Only works with gcc/clang and make). cmake -DEVENT__COVERAGE=1 -DCMAKE_BUILD_TYPE=Debug .. make make verify_coverage Current coverage (run on debian): Line coverage 79.1 % 10231 / 12939 Function coverage 86.1 % 933 / 1083