add more tests

spa/include/spa/buffer/buffer.h

@@ -43,6 +43,8 @@ enum spa_data_type {
 					  *  struct spa_data is set. */
 	SPA_DATA_MemFd,			/**< generic fd, mmap to get to memory */
 	SPA_DATA_DmaBuf,		/**< fd to dmabuf memory */
+
+	SPA_DATA_LAST,			/**< not part of ABI */
 };
 
 /** Chunk of memory */

spa/include/spa/buffer/meta.h

@@ -42,6 +42,8 @@ enum spa_meta_type {
 	SPA_META_VideoDamage,
 	SPA_META_Bitmap,
 	SPA_META_Cursor,
+
+	SPA_META_LAST,		/**< not part of ABI/API */
 };
 
 /**