So this test works on the basis that there is no vApp called `wibble-wobble_jonny_5`. It's a reasonable assumption for now, but it's not sustainable. What if someone new to the tool used the test `vdc_vapp_setup.yaml` to see how it worked and didn't delete it?

It would be better if the test set up an environment, confirm using query or walker that it is as expected, test, then tear down.