oinfo, err := obj.GetObjectInfo(context.Background(), bucketName, object, ObjectOptions{})
		if err != nil {
			t.Fatalf("Object: %s Object Index %d: Unexpected err: %v", object, oindex, err)
		}

		rs := partNumberToRangeSpec(oinfo, partNumber)
		size, err := oinfo.GetActualSize()
		if err != nil {
			t.Fatalf("Object: %s Object Index %d: Unexpected err: %v", object, oindex, err)
		}

		off, length, err := rs.GetOffsetLength(size)