t.Errorf("have=%q", written)
				}
			}
		}
	}
}

func TestWriterAppend(t *testing.T) {
	got := new(bytes.Buffer)
	var want []byte
	rn := rand.New(rand.NewSource(0))
	w := NewWriterSize(got, 64)
	for i := 0; i < 100; i++ {
		// Obtain a buffer to append to.
		b := w.AvailableBuffer()
		if w.Available() != cap(b) {