$ cd build
$ ctest

Test project /home/user/catch2-demo/build
    Start 1: Use the example library to add numbers
1/2 Test #1: Use the example library to add numbers ........   Passed    0.01 sec
    Start 2: Use the example library to subtract numbers
2/2 Test #2: Use the example library to subtract numbers ...   Passed    0.01 sec

100% tests passed, 0 tests failed out of 2

Label Time Summary:
unit    =   0.01 sec*proc (2 tests)

Total Test time (real) =   0.02 sec

$ cd build 
$ ./bin/unit_tests --success

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
unit_tests is a Catch v2.13.4 host application.
Run with -? for options

-------------------------------------------------------------------------------
Use the example library to add numbers
-------------------------------------------------------------------------------
/home/user/catch2-demo/test/example_add.cpp:7
...............................................................................

/home/user/catch2-demo/test/example_add.cpp:9: PASSED:
  REQUIRE( res == 3.0_a )
with expansion:
  3.0 == Approx( 3.0 )

-------------------------------------------------------------------------------
Use the example library to subtract numbers
-------------------------------------------------------------------------------
/home/user/catch2-demo/test/example_subtract.cpp:7
...............................................................................

/home/user/catch2-demo/test/example_subtract.cpp:9: PASSED:
  REQUIRE( res == -1.0_a )
with expansion:
  -1.0 == Approx( -1.0 )

===============================================================================
All tests passed (2 assertions in 2 test cases)