Catch2 CLion error, "No tests were found" - c++

Question

I have a folder structure like
and I am trying to get Catch2 setup, my CMake files look like:
the topmost CMake:
cmake_minimum_required(VERSION 3.21)
project(throwaway)
set(CMAKE_CXX_STANDARD 14)
add_subdirectory(src)
add_subdirectory(tests)
add_executable(foo_main main.cpp)
target_link_libraries(foo_main PUBLIC foo_lib)
my src CMake:
add_subdirectory(foo)
my src/foo CMake:
add_library(foo_lib Foo.cpp)
my tests CMake:
add_subdirectory(foo)
add_executable(foo_test catch_runner.cpp)
target_link_libraries(foo_test PUBLIC
foo_test_lib)
my tests/foo CMake
add_library(foo_test_lib
FooTests.cpp)
target_link_libraries(foo_test_lib PUBLIC
foo_lib)
From there, I used Clion's Catch2 integration to set up my run config as
so nothing crazy here
However, I get this error:
I discovered that the error goes away if I edit the tests CMake into
add_executable(foo_test catch_runner.cpp foo/FooTests.cpp)
target_link_libraries(foo_test PUBLIC foo_lib)
and the test works as expected. But I obviously don't want to manually add each file into an executable, I want to be able to make a library that I can just slap the catch_runner into.
I have no clue why the test doesn't work when I link it as a library, but works when I add it manually. Any ideas?

Answer 1

Figured out it from the links at How do you add separate test files with Catch2 and CMake?
in my tests/foo CMake I changed it to
add_library(foo_test_lib OBJECT
FooTests.cpp)
target_link_libraries(foo_test_lib PUBLIC
foo_lib)