Fix CMake subdir test

* Fix CMake subdir test

`add_test(main main)` treats the 2nd argument as the command to run.

The one-argument (or named argument variant) supports resolving target names so it will always find it

* Use named arguments for subdir-add_test

Author: Flamefire

test/cmake_subdir_test/CMakeLists.txt

@@ -39,6 +39,6 @@ add_executable(main main.cpp)
 target_link_libraries(main Boost::openmethod)
 
 enable_testing()
-add_test(main main)
+add_test(NAME main COMMAND main)
 
 add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)