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

		off, length, err := rs.GetOffsetLength(size)
		if err != nil {
			t.Fatalf("Object: %s Object Index %d: Unexpected err: %v", object, oindex, err)
		}

		readers := []io.Reader{}
		cumulativeSum := int64(0)
		for _, p := range oi.partLengths {
			readers = append(readers, NewDummyDataGen(p, cumulativeSum))