File src/0dev.org/encoding/mtf/mtf_test.go artifact 8e70ad85db part of check-in 470d7e947b

package mtf

import (
	diff "0dev.org/diff"
	"bytes"
	"io"
	"testing"
)

func TestMTF(t *testing.T) {
	var (
		data []byte = []byte{1, 1, 0, 0}

		input   *bytes.Reader = bytes.NewReader(data)
		encoder io.Reader     = Encoder(input)
		decoder io.Reader     = Decoder(encoder)

		output bytes.Buffer
	)

	io.Copy(&output, decoder)
	processed := output.Bytes()

	delta := diff.Diff(diff.D{Len1: len(data), Len2: len(processed),
		EqualFunc: func(i, j int) bool { return data[i] == processed[j] }})
	if len(delta.Added) > 0 || len(delta.Removed) > 0 {
		t.Error("Differences detected ", delta)
	}
}

// func TestEncoder(t *testing.T) {
// 	var (
// 		input    []byte = []byte{1, 1, 0, 0}
// 		expected []byte = []byte{1, 0, 1, 0}

// 		buffer  bytes.Buffer
// 		encoder io.Writer = Encoder(&buffer)
// 	)

// 	count, err := encoder.Write(input)
// 	if count != len(input) {
// 		t.Error("Unexpected write count from encoder", count)
// 	}
// 	if err != nil {
// 		t.Error("Unexpected write error from encoder", err)
// 	}

// 	output := buffer.Bytes()

// 	// Diff the output against the expected result
// 	delta := diff.Diff(diff.D{Len1: len(expected), Len2: len(output),
// 		EqualFunc: func(i, j int) bool { return expected[i] == output[j] }})
// 	if len(delta.Added) > 0 || len(delta.Removed) > 0 {
// 		t.Error("Differences detected ", delta)
// 	}
// }

// func TestDecoder(t *testing.T) {
// 	var (
// 		input    []byte = []byte{1, 0, 1, 0}
// 		expected []byte = []byte{1, 1, 0, 0}
// 		output   []byte = make([]byte, 4)

// 		reader  *bytes.Reader = bytes.NewReader(input)
// 		decoder io.Reader     = Decoder(reader)
// 	)

// 	count, err := decoder.Read(output)
// 	if count != len(output) {
// 		t.Error("Unexpected read count from decoder", count)
// 	}
// 	if err != nil {
// 		t.Error("Unexpected read error from decoder", err)
// 	}

// 	// Diff the output against the expected result
// 	delta := diff.Diff(diff.D{Len1: len(expected), Len2: len(output),
// 		EqualFunc: func(i, j int) bool { return expected[i] == output[j] }})
// 	if len(delta.Added) > 0 || len(delta.Removed) > 0 {
// 		t.Error("Differences detected ", delta)
// 	}
// }