if !bytes.Equal(dst, src) {
					report("", fmt.Errorf("bytes differ after round-tripping"))
					continue
				}
			}
		}
	}
}

func TestBestSpeedShiftOffsets(t *testing.T) {
	// Test if shiftoffsets properly preserves matches and resets out-of-range matches
	// seen in https://github.com/golang/go/issues/4142
	enc := newDeflateFast()

	// testData may not generate internal matches.
	testData := make([]byte, 32)