We don't ever call group_ensure() with a non-null group, and
libmeanwhile takes steps to ensure a group never has a NULL name,
so this can't happen. But this makes clang happier.
#include<string.h>
#include"tests.h"
#include"../xmlnode.h"
/*
* If we really wanted to test the billion laughs attack we would
* need to have more than just 4 ha's. But as long as this shorter
* document fails to parse, the longer one should also fail to parse.