Add helper macro for running test functions

tests/wapptest.c

@@ -3,9 +3,10 @@
 #include <stdlib.h>
 
 int main(void) {
-  run_tests(test_arena_init, test_arena_alloc_succeeds_when_within_capacity,
-            test_arena_alloc_fails_when_over_capacity, test_arena_clear,
-            test_arena_destroy);
+  RUN_TEST_FUNCS(test_arena_init,
+                 test_arena_alloc_succeeds_when_within_capacity,
+                 test_arena_alloc_fails_when_over_capacity, test_arena_clear,
+                 test_arena_destroy);
 
   return EXIT_SUCCESS;
 }