Update broken test after v1.15

Author: brunoocasali

docker-compose.yml

@@ -14,7 +14,7 @@ services:
       - ./:/home/package
 
   meilisearch:
-    image: getmeili/meilisearch:latest
+    image: getmeili/meilisearch:v1.15.0
     ports:
       - "7700:7700"
     environment:

tests/utils/tasks-and-batches.ts

@@ -49,7 +49,7 @@ const customAssertions = {
   },
 
   isBatch(batch: Batch) {
-    extAssert.lengthOf(Object.keys(batch), 7);
+    extAssert.lengthOf(Object.keys(batch), 8);
 
     const { uid, progress, details, stats, duration, startedAt, finishedAt } =
       batch;