ctest unit tests are run twice

[LecrisUT]

If I read this part correctly

xtl/test/CMakeLists.txt

Lines 120 to 135 in 174e99d

	foreach(filename IN LISTS XTL_TESTS)
	get_filename_component(targetname ${filename} NAME_WE)
	add_executable(${targetname} main.cpp ${filename} ${XTL_HEADERS})
	target_include_directories(${targetname} PRIVATE ${XTL_INCLUDE_DIR})
	target_link_libraries(${targetname} xtl doctest::doctest Threads::Threads ${nlohmann_json_TARGET})
	add_test(NAME ${targetname} COMMAND ${targetname})
	endforeach()
	add_executable(test_xtl main.cpp ${XTL_TESTS} ${XTL_HEADERS})
	target_include_directories(test_xtl PRIVATE ${XTL_INCLUDE_DIR})
	target_link_libraries(test_xtl xtl doctest::doctest Threads::Threads ${nlohmann_json_TARGET})
	add_custom_target(xtest COMMAND test_xtl DEPENDS test_xtl)
	add_test(NAME xtest COMMAND test_xtl)

The ctest would run eact test twice, once in xtest and once in ${targetname}. Why not get rid of the former?

Also the custom target calling test_xtl is not very efficient because it would not be parallelized. I've seen implementations where the target is just a thin wrapper around ctest with appropriate filters/environment variables.