pkg: hide it by moving to _pkg.dev

The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.

_pkg.dev/wire/payload/mgetheaders_test.go

@@ -0,0 +1,47 @@
+package payload
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"testing"
+
+	"github.com/CityOfZion/neo-go/pkg/wire/util/Checksum"
+
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
+	"github.com/stretchr/testify/assert"
+)
+
+// Test taken from neo-go v1
+func TestGetHeadersEncodeDecode(t *testing.T) {
+
+	var (
+		start = []util.Uint256{
+			sha256.Sum256([]byte("a")),
+			sha256.Sum256([]byte("b")),
+			sha256.Sum256([]byte("c")),
+			sha256.Sum256([]byte("d")),
+		}
+		stop = sha256.Sum256([]byte("e"))
+	)
+	msgGetHeaders, err := NewGetHeadersMessage(start, stop)
+	assert.Equal(t, nil, err)
+
+	buf := new(bytes.Buffer)
+
+	err = msgGetHeaders.EncodePayload(buf)
+	assert.Equal(t, nil, err)
+	expected := checksum.FromBuf(buf)
+
+	msgGetHeadersDec, err := NewGetHeadersMessage([]util.Uint256{}, util.Uint256{})
+	assert.Equal(t, nil, err)
+
+	r := bytes.NewReader(buf.Bytes())
+	err = msgGetHeadersDec.DecodePayload(r)
+	assert.Equal(t, nil, err)
+
+	buf = new(bytes.Buffer)
+	err = msgGetHeadersDec.EncodePayload(buf)
+	have := checksum.FromBuf(buf)
+
+	assert.Equal(t, expected, have)
+}