1 files changed, 8 insertions, 4 deletions
diff --git a/tests/sdl_image_prepare_data.c b/tests/sdl_image_prepare_data.c
index fdad16d1..87e33399 100644
--- a/tests/sdl_image_prepare_data.c
+++ b/tests/sdl_image_prepare_data.c
@@ -25,18 +25,22 @@ int testImage(const char* fileName) {
   return result;
 }
 
-void ready(char *data, const char *fileName) {
-  printf("ready! %s\n", fileName);
+void ready(void *arg, const char *fileName) {
+  printf("ready! %s (%d)\n", fileName, (int)arg);
 
   static int first = 1;
   static const char *seenName;
+  static void *seenArg;
   if (first) {
     first = 0;
     seenName = fileName;
+    seenArg = arg;
   } else {
     printf("%s ? %s == %d\n", fileName, seenName, strcmp(fileName, seenName));
     assert(strcmp(fileName, seenName)); // different names
 
+    assert(seenArg != arg); // different args
+
     testImage(seenName);
 
     free(seenName); // As the API docs say, we are responsible for freeing the 'fake' names we are given
@@ -57,8 +61,8 @@ int main() {
   fread(buffer, SIZE, 1, f);
   fclose(f);
 
-  emscripten_async_prepare_data(buffer, SIZE, "jpg", ready, NULL);
-  emscripten_async_prepare_data(buffer, SIZE, "jpg", ready, NULL); // twice to see different filenames
+  emscripten_async_prepare_data(buffer, SIZE, "jpg", (void*)25, ready, NULL);
+  emscripten_async_prepare_data(buffer, SIZE, "jpg", (void*)33, ready, NULL); // twice to see different filenames
 
   return 0;
 }