[doctest] run with "--help" for options
hello from <lib_1_src1.cpp>
hello from <lib_1_src2.cpp>
hello from <lib_2_src.cpp>
hello from <main.cpp>
===============================================================================
[doctest] test cases:      4 |      4 passed |      0 failed |      0 skipped
[doctest] assertions:      0 |      0 passed |      0 failed |
[doctest] Status: SUCCESS!
