fa4b8c90d3 test: add_nodes can only be called once after set_test_params (MarcoFalke)
faa831102a Revert "tests: Support calling add_nodes more than once" (MarcoFalke)
Pull request description:
Writing tests should be straightforward and with little side-effects as possible.
I don't see how this is needed and can not be achieved with `self.num_nodes` (and `self.extra_args` et al.)
Tree-SHA512: 83a67f2cba9d97e21d80847ff405a4633fcb0d5674486efa57ee1813e46efe8709ae0fb462b8339a01ebeca5c4f2d29ecb1807d648b8fd9ee8ce336b08d580a8