Function testWithReactor

Run a test inside a reactor

int testWithReactor (
  int delegate() dg,
  Reactor.OpenOptions options = Reactor.OpenOptions.init
);

void testWithReactor (
  void delegate() dg,
  Reactor.OpenOptions options = Reactor.OpenOptions.init
);

This is a convenience function for running a UT as a reactor fiber. A new reactor will be initialized, dg called and the reactor will automatically stop when dg is done.