Add a unit test for tor_log_mallinfo()

src/test/test_util.c

@@ -6262,6 +6262,57 @@ test_util_get_unquoted_path(void *arg)
   tor_free(r);
 }
 
+static void
+test_util_log_mallinfo(void *arg)
+{
+  (void)arg;
+  char *log1 = NULL, *log2 = NULL, *mem = NULL;
+#ifdef HAVE_MALLINFO
+  setup_capture_of_logs(LOG_INFO);
+  tor_log_mallinfo(LOG_INFO);
+  expect_single_log_msg_containing("mallinfo() said: ");
+  mock_saved_log_entry_t *lg = smartlist_get(mock_saved_logs(), 0);
+  log1 = tor_strdup(lg->generated_msg);
+
+  mock_clean_saved_logs();
+  mem = tor_malloc(8192);
+  tor_log_mallinfo(LOG_INFO);
+  expect_single_log_msg_containing("mallinfo() said: ");
+  lg = smartlist_get(mock_saved_logs(), 0);
+  log2 = tor_strdup(lg->generated_msg);
+
+  /* Make sure that the amount of used memory increased. */
+  const char *used1 = strstr(log1, "uordblks=");
+  const char *used2 = strstr(log2, "uordblks=");
+  tt_assert(used1);
+  tt_assert(used2);
+  used1 += strlen("uordblks=");
+  used2 += strlen("uordblks=");
+
+  int ok1, ok2;
+  char *next1 = NULL, *next2 = NULL;
+  uint64_t mem1 = tor_parse_uint64(used1, 10, 0, UINT64_MAX, &ok1, &next1);
+  uint64_t mem2 = tor_parse_uint64(used2, 10, 0, UINT64_MAX, &ok2, &next2);
+  tt_assert(ok1);
+  tt_assert(ok2);
+  tt_assert(next1);
+  tt_assert(next2);
+  if (mem2 == 0) {
+    /* This is a fake mallinfo that doesn't actually fill in its outputs. */
+    tt_int_op(mem1, OP_EQ, 0);
+  } else {
+    tt_u64_op(mem1, OP_LT, mem2);
+  }
+#else
+  tt_skip();
+#endif
+ done:
+  teardown_capture_of_logs();
+  tor_free(log1);
+  tor_free(log2);
+  tor_free(mem);
+}
+
 #define UTIL_LEGACY(name)                                               \
   { #name, test_util_ ## name , 0, NULL, NULL }
 
@@ -6399,5 +6450,6 @@ struct testcase_t util_tests[] = {
   UTIL_TEST(monotonic_time_add_msec, 0),
   UTIL_TEST(htonll, 0),
   UTIL_TEST(get_unquoted_path, 0),
+  UTIL_TEST(log_mallinfo, 0),
   END_OF_TESTCASES
 };