Extend existing tests

Author: lucic71

tests/unit/alias_over_function_pointer.cpp

@@ -1,5 +1,6 @@
 #include <assert.h>
 #include <cstddef>
+#include <signal.h>
 #include <stddef.h>
 
 typedef int (*foo_t)(void *);
@@ -28,6 +29,10 @@ template <class H> struct HashHolder {
   HashHolder(const H &h) : h(h) {}
 };
 
+static int total = 0;
+
+void add_to_total(int x) { total += x; }
+
 int main() {
   foo_t fn = nullptr;
   assert(fn == nullptr);
@@ -55,5 +60,10 @@ int main() {
 
   HashHolder<std::size_t (*)(bool)> hh(identity_hash<bool>);
   assert(hh.h(true) == 1);
+
+  sig_t handler = add_to_total;
+  handler(2);
+  handler(3);
+  assert(total == 5);
   return 0;
 }