mohkale/cmakeresources-demo

CMakeResources demo test

Sample project demonstrating using CMake resources to distribute port allocations for an example test. Ideally use port 0 to just get a random port allocated but if you have a use case for a deterministic port that won't be duplicated across tests then this barely works.

cmake -S . -B build --preset\=default -DCMAKE_EXPORT_COMPILE_COMMANDS\=ON -DCMAKE_COLOR_DIAGNOSTICS\=ON
cmake --build build --preset\=default --parallel\=18
env CLICOLOR_FORCE\=1 GTEST_COLOR\=1 ctest --test-dir build --preset\=default --output-on-failure --schedule-random test

CTest will schedule upto 16 tests in parallel but because the portoffset resource in CMakeResources.txt only has 3 slots no more than 3 tests with a dependence on that resource will be defined. The project defines 15 tests all of the same executable and all it does is start up, read the resource environment, bind to a port succesfully and then wait a bit before exiting. To confirm the test never steps over port allocations you can try adding a modulo chock to the port read to make it step over itself.