fix: Added KeyCount property in ListObjectsV2 action result, added a test case for one

backend/posix/posix.go

@@ -1317,6 +1317,7 @@ func (p *Posix) ListObjectsV2(input *s3.ListObjectsV2Input) (*s3.ListObjectsV2Ou
 		Name:                  &bucket,
 		NextContinuationToken: &results.NextMarker,
 		Prefix:                &prefix,
+		KeyCount:              int32(len(results.Objects)),
 	}, nil
 }
 

integration/tests.go

@@ -426,6 +426,10 @@ func TestListObject(s *S3Conf) {
 		failF("object %v not found", obj2)
 		return
 	}
+	if out.KeyCount != 2 {
+		failF("%v: expected key count: %v, instead got: %v", testname, 2, out.KeyCount)
+		return
+	}
 
 	ctx, cancel = context.WithTimeout(context.Background(), shortTimeout)
 	_, err = s3client.DeleteObject(ctx, &s3.DeleteObjectInput{