Add build tag nomsgpack (#1852)

* add build tag nomsgpack

* Update copyright

* Update copyright

render/render_msgpack_test.go

@@ -0,0 +1,43 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+// +build !nomsgpack
+
+package render
+
+import (
+	"bytes"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/ugorji/go/codec"
+)
+
+// TODO unit tests
+// test errors
+
+func TestRenderMsgPack(t *testing.T) {
+	w := httptest.NewRecorder()
+	data := map[string]interface{}{
+		"foo": "bar",
+	}
+
+	(MsgPack{data}).WriteContentType(w)
+	assert.Equal(t, "application/msgpack; charset=utf-8", w.Header().Get("Content-Type"))
+
+	err := (MsgPack{data}).Render(w)
+
+	assert.NoError(t, err)
+
+	h := new(codec.MsgpackHandle)
+	assert.NotNil(t, h)
+	buf := bytes.NewBuffer([]byte{})
+	assert.NotNil(t, buf)
+	err = codec.NewEncoder(buf, h).Encode(data)
+
+	assert.NoError(t, err)
+	assert.Equal(t, w.Body.String(), string(buf.Bytes()))
+	assert.Equal(t, "application/msgpack; charset=utf-8", w.Header().Get("Content-Type"))
+}