blockchain: test vectors for proto encoding (#5073)

## Description

this PR adds test vectors for proto encoding. the main difference from amino was the removal of four bytes due to interface encoding.

should i add more cases?

Closes: #XXX

blockchain/msgs_test.go

@@ -1,10 +1,14 @@
 package blockchain
 
 import (
+	"math"
 	"testing"
 
+	"github.com/gogo/protobuf/proto"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	bcproto "github.com/tendermint/tendermint/proto/tendermint/blockchain"
+	"github.com/tendermint/tendermint/types"
 )
 
 func TestBcBlockRequestMessageValidateBasic(t *testing.T) {
@@ -86,3 +90,61 @@ func TestBcStatusResponseMessageValidateBasic(t *testing.T) {
 		})
 	}
 }
+
+func TestBlockchainMessageVectors(t *testing.T) {
+
+	block := types.MakeBlock(int64(3), []types.Tx{types.Tx("Hello World")}, nil, nil)
+
+	bpb, err := block.ToProto()
+	require.NoError(t, err)
+
+	testCases := []struct {
+		testName string
+		bmsg     proto.Message
+		expBytes []byte
+	}{
+		{"BlockRequestMessage", &bcproto.Message{Sum: &bcproto.Message_BlockRequest{
+			BlockRequest: &bcproto.BlockRequest{Height: 1}}}, []byte{0xa, 0x2, 0x8, 0x1}},
+		{"BlockRequestMessage", &bcproto.Message{Sum: &bcproto.Message_BlockRequest{
+			BlockRequest: &bcproto.BlockRequest{Height: math.MaxInt64}}},
+			[]byte{0xa, 0xa, 0x8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f}},
+		{"BlockResponseMessage", &bcproto.Message{Sum: &bcproto.Message_BlockResponse{
+			BlockResponse: &bcproto.BlockResponse{Block: bpb}}}, []byte{0x1a, 0x6e, 0xa, 0x6c,
+			0xa, 0x37, 0xa, 0x0, 0x18, 0x3, 0x22, 0xb, 0x8, 0x80, 0x92, 0xb8, 0xc3, 0x98, 0xfe,
+			0xff, 0xff, 0xff, 0x1, 0x2a, 0x2, 0x12, 0x0, 0x3a, 0x20, 0xc4, 0xda, 0x88, 0xe8,
+			0x76, 0x6, 0x2a, 0xa1, 0x54, 0x34, 0x0, 0xd5, 0xd, 0xe, 0xaa, 0xd, 0xac, 0x88, 0x9,
+			0x60, 0x57, 0x94, 0x9c, 0xfb, 0x7b, 0xca, 0x7f, 0x3a, 0x48, 0xc0, 0x4b, 0xf9, 0x12,
+			0x2f, 0xa, 0xb, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64,
+			0x12, 0x20, 0xc4, 0xda, 0x88, 0xe8, 0x76, 0x6, 0x2a, 0xa1, 0x54, 0x34, 0x0, 0xd5,
+			0xd, 0xe, 0xaa, 0xd, 0xac, 0x88, 0x9, 0x60, 0x57, 0x94, 0x9c, 0xfb, 0x7b, 0xca,
+			0x7f, 0x3a, 0x48, 0xc0, 0x4b, 0xf9, 0x1a, 0x0}},
+		{"NoBlockResponseMessage", &bcproto.Message{Sum: &bcproto.Message_NoBlockResponse{
+			NoBlockResponse: &bcproto.NoBlockResponse{Height: 1}}}, []byte{0x12, 0x2, 0x8, 0x1}},
+		{"NoBlockResponseMessage", &bcproto.Message{Sum: &bcproto.Message_NoBlockResponse{
+			NoBlockResponse: &bcproto.NoBlockResponse{Height: math.MaxInt64}}},
+			[]byte{0x12, 0xa, 0x8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f}},
+		{"StatusRequestMessage", &bcproto.Message{Sum: &bcproto.Message_StatusRequest{
+			StatusRequest: &bcproto.StatusRequest{Height: 1, Base: 2}}},
+			[]byte{0x22, 0x4, 0x8, 0x1, 0x10, 0x2}},
+		{"StatusRequestMessage", &bcproto.Message{Sum: &bcproto.Message_StatusRequest{
+			StatusRequest: &bcproto.StatusRequest{Height: math.MaxInt64, Base: math.MaxInt64}}},
+			[]byte{0x22, 0x14, 0x8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f,
+				0x10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f}},
+		{"StatusResponseMessage", &bcproto.Message{Sum: &bcproto.Message_StatusResponse{
+			StatusResponse: &bcproto.StatusResponse{Height: 1, Base: 2}}},
+			[]byte{0x2a, 0x4, 0x8, 0x1, 0x10, 0x2}},
+		{"StatusResponseMessage", &bcproto.Message{Sum: &bcproto.Message_StatusResponse{
+			StatusResponse: &bcproto.StatusResponse{Height: math.MaxInt64, Base: math.MaxInt64}}},
+			[]byte{0x2a, 0x14, 0x8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0x10,
+				0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f}},
+	}
+
+	for _, tc := range testCases {
+		tc := tc
+		t.Run(tc.testName, func(t *testing.T) {
+			bz, _ := proto.Marshal(tc.bmsg)
+
+			require.Equal(t, tc.expBytes, bz)
+		})
+	}
+}