Adding -DBUILD_TESTING=ON or adding "include(CTest)" to CMakeLists.txt in ufs-weather-model breaks the build

[mark-a-potts]

I would like to add a couple of ctests at the atmos_cubed_sphere level that would feed up/be recognized at the top level of the ufs-weather-model build. However, when I add "include(CTest)" to the CMakeLists.txt file in ufs-weather-model, this sets BUILD_TESTING=ON and FV3 tries to build the ci tests and that fails.

Can we either fix the ci section so that it builds with a normal, out-of-the-box build, or change the "BUILD_TESTING" variable to something like "BUILD_CI_TESTING"?

[edwardhartnett]

Certainly we can change BUILD_TESTING to BUILD_CI_TESTING.

I don't think we can use a normal, out of the box build, because the code will not build without some other components, which have to be mocked to allow unit testing to proceed.

I would like to get fv3atm tests working as a set of nested tests under ufs-weather-model.