test: added test for push front

src/arraylist.c

@@ -260,9 +260,9 @@ ArrayListErr arraylist_pop_front(ArrayList *arr, void *out) {
     }
 
     memmove(
-        arr->buffer + arr->elem_size,
         arr->buffer,
-        (arr->len - 1) * arr->elem_size);
+        arr->buffer + arr->elem_size,
+        arr->len * arr->elem_size);
 
     arr->len--;