@@ -1,8 +1,9 @@
 package fibonacci
 
 import (
+	diff "0dev.org/diff"
 	"bytes"
 	"io"
 	"strings"
 	"testing"
 )
@@ -34,15 +35,17 @@
 			t.Errorf("Unexpected difference between encoded and decoded lengths.", encLen, decLen)
 		}
 	}
 }
 
-func TestWriter(t *testing.T) {
-	var buf bytes.Buffer
-	var w io.Writer = Writer(&buf)
-	var input []byte = make([]byte, 256)
-	var fib Numbers = New(16)
+func TestWriterReader(t *testing.T) {
+	var (
+		buf   bytes.Buffer
+		w     io.Writer = Writer(&buf)
+		input []byte    = make([]byte, 256)
+		fib   Numbers   = New(16)
+	)
 
 	for i := uint64(0); i < 256; i++ {
 		input[i] = byte(i)
 	}
 
@@ -75,10 +78,26 @@
 		if loc := strings.Index(output, vs); loc != 0 {
 			t.Fatal("Unexpected location for", i, "value", vs)
 		}
 		output = output[len(vs):]
 	}
+
+	var (
+		in  *bytes.Reader = bytes.NewReader(buf.Bytes())
+		r   io.Reader     = Reader(in)
+		out bytes.Buffer
+	)
+	io.Copy(&out, r)
+	decoded := out.Bytes()
+
+	delta := diff.Diff(diff.D{Len1: len(decoded), Len2: len(input), EqualFunc: func(i, j int) bool {
+		return decoded[i] == input[j]
+	}})
+
+	if len(delta.Added) > 0 || len(delta.Removed) > 0 {
+		t.Error("Differences detected ", delta)
+	}
 }
 
 func u2s(b uint64, l byte) (result string) {
 	for i := byte(0); i < l; i++ {
 		if (b & 1) > 0 {