Alexander Hans

We've been bitten by this several times now. I think the benefit of catching inconsistencies between test runner and this repository is worth the additional time spent with CI runs....

The Catch2 version used here is different from what the [test runner ](https://github.com/exercism/cpp-test-runner) uses. To add to the chaos, for `complex-numbers` #995 adds the test runner's version, because for the...