Add a quick-and-dirty-test for generate_v2_networkstatus.

It sure is a good thing we can run each test in its own process, or
else the amount of setup I needed to do to make this thing work
would have broken all the other tests.

Test mocking would have made this easier to write too.

src/or/dirserv.c

@@ -2904,7 +2904,7 @@ dirserv_generate_networkstatus_vote_obj(crypto_pk_t *private_key,
 /** For v2 authoritative directories only: Replace the contents of
  * <b>the_v2_networkstatus</b> with a newly generated network status
  * object.  */
-static cached_dir_t *
+cached_dir_t *
 generate_v2_networkstatus_opinion(void)
 {
   cached_dir_t *r = NULL;

src/or/dirserv.h

@@ -120,6 +120,7 @@ int measured_bw_line_parse(measured_bw_line_t *out, const char *line);
 
 int measured_bw_line_apply(measured_bw_line_t *parsed_line,
                            smartlist_t *routerstatuses);
+cached_dir_t *generate_v2_networkstatus_opinion(void);
 #endif
 
 int dirserv_read_measured_bandwidths(const char *from_file,

src/test/test_dir.c

@@ -12,6 +12,7 @@
 #define ROUTERLIST_PRIVATE
 #define HIBERNATE_PRIVATE
 #include "or.h"
+#include "config.h"
 #include "directory.h"
 #include "dirserv.h"
 #include "dirvote.h"
@@ -2140,25 +2141,103 @@ test_dir_clip_unmeasured_bw_alt(void)
                        test_routerstatus_for_umbw);
 }
 
+extern time_t time_of_process_start; /* from main.c */
+
+static void
+test_dir_v2_dir(void *arg)
+{
+  /* Runs in a forked process: acts like a v2 directory just enough to make and
+   * sign a v2 networkstatus opinion */
+
+  cached_dir_t *v2 = NULL;
+  or_options_t *options = get_options_mutable();
+  crypto_pk_t *id_key = pk_generate(4);
+  (void) arg;
+
+  options->ORPort_set = 1; /* So we believe we're a server. */
+  options->DirPort_set = 1;
+  options->Address = tor_strdup("99.99.99.99");
+  options->Nickname = tor_strdup("TestV2Auth");
+  options->ContactInfo = tor_strdup("TestV2Auth <testv2auth@example.com>");
+  {
+    /* Give it a DirPort */
+    smartlist_t *ports = (smartlist_t *)get_configured_ports();
+    port_cfg_t *port = tor_malloc_zero(sizeof(port_cfg_t));
+    port->type = CONN_TYPE_DIR_LISTENER;
+    port->port = 9999;
+    smartlist_add(ports, port);
+  }
+  set_server_identity_key(id_key);
+  set_client_identity_key(id_key);
+
+  /* Add a router. */
+  {
+    was_router_added_t wra;
+    const char *msg = NULL;
+    routerinfo_t *r1 = tor_malloc_zero(sizeof(routerinfo_t));
+    r1->address = tor_strdup("18.244.0.1");
+    r1->addr = 0xc0a80001u; /* 192.168.0.1 */
+    r1->cache_info.published_on = time(NULL)-60;
+    r1->or_port = 9000;
+    r1->dir_port = 9003;
+    tor_addr_parse(&r1->ipv6_addr, "1:2:3:4::");
+    r1->ipv6_orport = 9999;
+    r1->onion_pkey = pk_generate(1);
+    r1->identity_pkey = pk_generate(2);
+    r1->bandwidthrate = 1000;
+    r1->bandwidthburst = 5000;
+    r1->bandwidthcapacity = 10000;
+    r1->exit_policy = NULL;
+    r1->nickname = tor_strdup("Magri");
+    r1->platform = tor_strdup("Tor 0.2.7.7-gamma");
+    r1->cache_info.routerlist_index = -1;
+    r1->cache_info.signed_descriptor_body =
+      router_dump_router_to_string(r1, r1->identity_pkey);
+    r1->cache_info.signed_descriptor_len =
+      strlen(r1->cache_info.signed_descriptor_body);
+    wra = router_add_to_routerlist(r1, &msg, 0, 0);
+    tt_int_op(wra, ==, ROUTER_ADDED_SUCCESSFULLY);
+  }
+
+  /* Prevent call of rep_hist_note_router_unreachable(). */
+  time_of_process_start = time(NULL);
+
+  /* Make a directory so there's somewhere to store the thing */
+#ifdef _WIN32
+  mkdir(get_fname("cached-status"));
+#else
+  mkdir(get_fname("cached-status"), 0700);
+#endif
+
+  v2 = generate_v2_networkstatus_opinion();
+  tt_assert(v2);
+
+ done:
+  crypto_pk_free(id_key);
+  cached_dir_decref(v2);
+}
+
+
 #define DIR_LEGACY(name)                                                   \
   { #name, legacy_test_helper, TT_FORK, &legacy_setup, test_dir_ ## name }
 
-#define DIR(name)                               \
-  { #name, test_dir_##name, 0, NULL, NULL }
+#define DIR(name,flags)                              \
+  { #name, test_dir_##name, (flags), NULL, NULL }
 
 struct testcase_t dir_tests[] = {
   DIR_LEGACY(nicknames),
   DIR_LEGACY(formats),
   DIR_LEGACY(versions),
   DIR_LEGACY(fp_pairs),
-  DIR(split_fps),
+  DIR(split_fps, 0),
   DIR_LEGACY(measured_bw),
   DIR_LEGACY(param_voting),
   DIR_LEGACY(v3_networkstatus),
-  DIR(random_weighted),
-  DIR(scale_bw),
+  DIR(random_weighted, 0),
+  DIR(scale_bw, 0),
   DIR_LEGACY(clip_unmeasured_bw),
   DIR_LEGACY(clip_unmeasured_bw_alt),
+  DIR(v2_dir, TT_FORK),
   END_OF_TESTCASES
 };