tests: add tests on function util_signal_search

src/core/wee-util.c

@@ -422,6 +422,9 @@ util_signal_search (const char *name)
 {
     int i;
 
+    if (!name)
+        return -1;
+
     for (i = 0; util_signals[i].name; i++)
     {
         if (string_strcasecmp (util_signals[i].name, name) == 0)

src/core/wee-util.h

@@ -36,6 +36,8 @@ struct t_util_signal
     int signal;                        /* signal number                     */
 };
 
+extern struct t_util_signal util_signals[];
+
 /* limits */
 extern void util_setrlimit ();