As a user of QTestLib, I'd like to use Catch2-style hierarchical SCENARIO/GIVEN/WHEN/THEN tests

SCENARIO("....") {
    ~~~ setup ~~~~
    GIVEN(".....") {
         ~~~ setup ~~~~
         WHEN("....") {
             ~~~~ action ~~~~
             THEN("....") {
                 ~~~~ checks ~~~~
              }
          }
          ~~~ more WHEN ~~~~
    }
    ~~~~ more GIVEN ~~~~
}
~~~~ more SCENARIOs ~~~~