compat.c-ares

// Behavioral test for compat.c-ares.
//
// Entirely OFFLINE — no DNS query is ever sent, so the result does not depend
// on the runner's network. What it does exercise is the machinery gRPC's
// resolver actually leans on, and each piece lives in a different part of the
// library:
//
//   ares_library_init / _cleanup   -> src/lib/ares_library_init.c
//   ares_init_options / ares_destroy -> ares_init.c, ares_options.c, util/*
//   set/get servers as CSV         -> ares_options.c, str/*, record/* (parsing
//                                     an address list is real string+record work)
//   ares_inet_pton / ares_inet_ntop -> inet_net_pton.c, inet_ntop.c
//   ares_strerror                  -> ares_strerror.c
//
// Returns non-zero on any mismatch.
#include <cstring>
#include <string>

#include "ares.h"

namespace {

// …