Update firebase-firestore/src/test/java/com/google/firebase/firestore/local/LocalStoreTestCase.java

Co-authored-by: Sebastian Schmidt <[email protected]>

Author: wu-hui

firebase-firestore/src/test/java/com/google/firebase/firestore/local/LocalStoreTestCase.java

@@ -158,15 +158,9 @@ private void acknowledgeMutationWithTransformResults(
     MutationBatch batch = batches.remove(0);
     SnapshotVersion version = version(documentVersion);
     List<MutationResult> mutationResults =
-        Collections.singletonList(new MutationResult(version, emptyList()));
-
-    if (transformResult.length != 0) {
-      mutationResults = new ArrayList<>();
-      for (Object o : transformResult) {
-        mutationResults.add(
-            new MutationResult(version, Collections.singletonList(TestUtil.wrap(o))));
-      }
-    }
+        Arrays.stream(transformResult)
+            .map(r -> new MutationResult(version, Collections.singletonList(TestUtil.wrap(r))))
+            .collect(Collectors.toList());
     MutationBatchResult result =
         MutationBatchResult.create(batch, version, mutationResults, WriteStream.EMPTY_STREAM_TOKEN);
     lastChanges = localStore.acknowledgeBatch(result);